Unions who back a wealth tax

The strongest evidence first. Each name opens its dated, quoted sources.

Unite the Union: Trade union (United Kingdom, grade A)
CCOO: Trade union confederation (Comisiones Obreras) (Spain, grade A)
Deutscher Gewerkschaftsbund (DGB): Trade union confederation (Germany, grade A)
UGT: Trade union confederation (Unión General de Trabajadores) (Spain, grade A)
American Federation of Labor and Congress of Industrial Organizations (AFL-CIO): Labor federation (United States, grade A)
American Federation of Teachers (AFT): Union (United States, grade A)
Confédération générale du travail (CGT): Trade union confederation (France, grade A)
National Education Association: Union (United States, grade A)
Service Employees International Union (SEIU): Union (United States, grade A)
Vereinte Dienstleistungsgewerkschaft (ver.di): Services trade union (Germany, grade A)
AFSCME California PEOPLE Committee: Statewide public-employee political committee (United States, grade A)
American Federation of Government Employees (AFGE): Union (United States, grade A)
American Federation of State, County, and Municipal Employees (AFSCME): Union (United States, grade A)
Asociación Nacional de Empleados Públicos y Privados (ANEP): Union confederation (Costa Rica, grade A)
Bloque Unitario Social Sindical Costarricense (BUSSCO): Union bloc (Costa Rica, grade A)
California Federation of Labor Unions, AFL-CIO: California’s AFL-CIO labor federation (United States, grade A)
California Nurses Association: Nurses’ union (United States, grade A)
Central Coast Labor Council, AFL-CIO (United States, grade A)
FNV: Trade union confederation (Netherlands, grade A)
Fire Brigades Union (FBU): Union for firefighters (United Kingdom, grade A)
Gewerkschaft Erziehung und Wissenschaft (GEW): Education and science trade union (Germany, grade A)
IAM Union (International Association of Machinists and Aerospace Workers): Union, 600,000 members (United States, grade A)
Langile Abertzaleen Batzordeak (LAB): Basque trade union (Spain, grade A)
National Union of Healthcare Workers (United States, grade A)
SEIU-UHW: Healthcare workers union (United States, grade A)
San Diego County Building and Construction Trades Council: Coalition of 22 affiliated construction and trade unions (United States, grade A)
Sheet Metal Workers’ (SMART) Local 104: Sheet metal workers’ union (United States, grade A)
South African Federation of Trade Unions: South African trade union federation (South Africa, grade A)
Teamsters California: California Teamsters organization (United States, grade A)
Trades Union Congress (TUC): UK trade union confederation (United Kingdom, grade A)
UNITE HERE: Union (United States, grade A)
United Steelworkers: Union (United States, grade A)
United Teachers Los Angeles (United States, grade A)
3F: United Federation of Danish Workers (Denmark, grade A)
ABVV: Socialist trade union confederation (Algemeen Belgisch Vakverbond / Fédération G (Belgium, grade A)
ACV: Christian trade union confederation (Algemeen Christelijk Vakverbond / CSC) (Belgium, grade A)
All-Poland Alliance of Trade Unions (OPZZ): National trade union confederation (Poland, grade A)
Alliance des professeures et professeurs de Montréal (FAE): Quebec labour organisation; manifesto signatory (Canada, grade A)
Alliance du personnel professionnel et technique de la santé et des services sociaux: Quebec health and social-services professionals union (APTS) (Canada, grade A)
Asian Pacific American Labor Alliance, AFL-CIO: Signatory, coalition letter (United States, grade A)
Australian Manufacturing Workers’ Union: Manufacturing workers union (Australia, grade A)
BUPL: Union for educators (Denmark, grade A)
British Columbia Federation of Labour: Provincial labour federation (Canada, grade A)
CGIL: National trade union confederation (Confederazione Generale Italiana del Lavoro) (Italy, grade A)
CGT Finances Publiques: Public finances federation of the CGT (tax administration staff) (France, grade A)
California Federation of Teachers: Union; sponsor of AB 259 / ACA 3 (United States, grade A)
Canadian Union of Postal Workers: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Canadian Union of Public Employees: National trade union (Canada, grade A)
Central Organisation of Finnish Trade Unions (SAK): Trade union confederation (Finland, grade A)
Central de Trabajadores de la Argentina de los Trabajadores: Signatory to Espacio Producción y Trabajo statement (Argentina, grade A)
Centrale des syndicats du Québec: Quebec labour federation (Canada, grade A)
Centrale des syndicats démocratiques (CSD): Quebec labour organisation; manifesto signatory (Canada, grade A)
Coalition of Labor Union Women: Signatory, coalition letter (United States, grade A)
Comisión Nacional de Enlace (CNE): Coordination body of Costa Rican unions and social organisations (Costa Rica, grade A)
Communication Workers Union (CWU): Union for postal and telecoms workers (United Kingdom, grade A)
Confederación Argentina de Trabajadores Cooperativos Asociados: Signatory to Espacio Producción y Trabajo statement (Argentina, grade A)
Confederation of Progressive Trade Unions of Turkey (Turkey, grade A)
Confederation of Public Employees' Trade Unions (Turkey, grade A)
Confederația Națională Sindicală Cartel Alfa: Trade union confederation (Romania, grade A)
Confederația Națională a Sindicatelor Libere din România – Frăția: Trade union confederation (Romania, grade A)
Confédération Démocratique du Travail: National trade union confederation (Chambre des Conseillers parliamentary group) (Morocco, grade A)
Confédération française démocratique du travail (CFDT): Trade union confederation (France, grade A)
Congress of Union Retirees of Canada: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Conseil central de Lanaudière–CSN: Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central de Québec-Chaudière-Appalaches (CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central de la Gaspésie et des Îles-de-la-Madeleine (CCGIM–CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central de la Montérégie–CSN: Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central de l’Abitibi-Témiscamingue–Nord-du-Québec (CCATNQ–CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central des syndicats nationaux de l’Outaouais (CCSNO-CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central des syndicats nationaux du Saguenay-Lac-Saint-Jean (CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central du Bas-Saint-Laurent (CCBSL-CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central du Cœur du Québec (CCCQ–CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Conseil central du Montréal métropolitain–CSN: Quebec labour organisation; manifesto signatory (Canada, grade A)
Corriente Federal de los Trabajadores: Signatory to Espacio Producción y Trabajo statement (Argentina, grade A)
Durham Region Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Education and Science Workers' Union (Turkey, grade A)
Efling – stéttarfélag (Iceland, grade A)
Euskal Langileen Alkartasuna (ELA): Basque trade union (Spain, grade A)
FNV Noord: Northern regional organisation of FNV (Netherlands, grade A)
FOA: Public sector trade union (Denmark, grade A)
Fagbevægelsens Hovedorganisation: Trade union confederation (Denmark, grade A)
Fagforbundet: Trade union (Norway, grade A)
Federación Nacional de Trabajadores Agroindustriales, Campesinos e Indígenas Libres del Ecuador (FENACLE): Agro-industrial, peasant and indigenous workers' federation (Ecuador, grade A)
Fellesforbundet: Trade union (Norway, grade A)
Firelands Workers United / Trabajadores Unidos: Signatory, coalition letter (United States, grade A)
Fédération autonome de l’enseignement (FAE): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération de l’enseignement collégial (FEC-CSQ): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération des employées et employés de services publics (FEESP-CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération des professionnèles (FP-CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération des syndicats de l’action collective (FSAC-CSQ): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération des travailleurs et travailleuses du Québec (FTQ): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération du personnel de soutien de l’enseignement supérieur (CSQ): Quebec labour organisation; manifesto signatory (Canada, grade A)
Fédération interprofessionnelle de la santé du Québec: Quebec nursing and healthcare professionals federation (Canada, grade A)
Fédération interprofessionnelle de la santé du Québec – Secteur privé: Quebec nursing and healthcare professionals federation (Canada, grade A)
Fédération nationale des enseignantes et enseignants du Québec (FNEEQ-CSN): Quebec labour organisation; manifesto signatory (Canada, grade A)
Gewerkschaft Bau-Holz (GBH): Trade union (Austria, grade A)
Gewerkschaft GPA: Trade union (Austria, grade A)
Gewerkschaft PRO-GE: Trade union (Austria, grade A)
Gewerkschaft vida: Trade union (Austria, grade A)
Grey-Bruce Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
International Brotherhood of Teamsters: Signatory, coalition letter (United States, grade A)
International Federation of Professional and Technical Engineers (IFPTE): Signatory, coalition letter (United States, grade A)
International Union, United Automobile, Aerospace, and Agricultural Implement Workers of America (UAW): Signatory, coalition letter (United States, grade A)
Irish Congress of Trade Unions: Trade union confederation (Ireland, grade A)
Japan Federation of National Public Service Employees Unions (国公労連): National public service trade union federation (Japan, grade A)
Korean Confederation of Trade Unions (전국민주노동조합총연맹): Trade union confederation (South Korea, grade A)
Landsorganisasjonen i Norge: Trade union confederation (Norway, grade A)
National Confederation of Trade Unions (全国労働組合総連合): Trade union (Japan, grade A)
National Nurses United: Largest US union of registered nurses (United States, grade A)
National Tax Collectors' Union (全国税労働組合): Trade union (Japan, grade A)
National Union of Public and General Employees: National union federation; submitter of resolution ESP-030 (Canada, grade A)
Norsk Arbeidsmandsforbund: Trade union for workers in facilities, security, cleaning, and extraction (NAF) (Norway, grade A)
Norsk Tjenestemannslag: Civil service trade union (Norway, grade A)
North Bay and District Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Oregon Education Association: Education employees' union (United States, grade A)
PIT-CNT: Uruguay's single national trade-union confederation (Uruguay, grade A)
Pride at Work: Signatory, coalition letter (United States, grade A)
Public Service Association: Public service trade union (New Zealand, grade A)
RMT: Rail, Maritime and Transport Workers union (United Kingdom, grade A)
Raad van Vakcentrales in Suriname: National trade union confederation (Suriname, grade A)
Regina and District Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
STTK: Finnish Confederation of Professionals (Finland, grade A)
Sağlık ve Sosyal Hizmet Emekçileri Sendikası (Turkey, grade A)
Scottish Trades Union Congress (STUC): Scottish trade union confederation (United Kingdom, grade A)
Sindicato Mexicano de Electricistas: Electricians’ union (Mexico, grade A)
Sudbury and District Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Syndicat canadien de la fonction publique (SCFP-Québec): Quebec labour organisation; manifesto signatory (Canada, grade A)
Syndicat de la fonction publique et parapublique du Québec: Quebec public-service trade union (Canada, grade A)
Syndicat québécois des employées et employés de services, section locale 298 (FTQ): Quebec labour organisation; manifesto signatory (Canada, grade A)
TSSA: Transport Salaried Staffs Association (United Kingdom, grade A)
Teamsters Canada: National trade union (Canada, grade A)
Thunder Bay and District Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Toronto and York Region Labour Council: Submitting body of CLC2023 resolution ESP-012: Fair Taxation (Canada, grade A)
Trade Union for the Public and Welfare Sectors (JHL): Trade union (Finland, grade A)
Turkish Medical Association (Turkey, grade A)
UAW Region 6: Western-states region of the United Auto Workers (about 120,000 members) (United States, grade A)
Unifor: National private-sector trade union (Canada, grade A)
Union of Chambers of Turkish Engineers and Architects (Turkey, grade A)
United Metalworkers' Union (Turkey, grade A)
Österreichischer Gewerkschaftsbund (ÖGB): Trade union confederation (Austria, grade A)
CUT (Central Única dos Trabalhadores) (Brazil, grade B)
Confederation of Independent Trade Unions in Bulgaria (KNSB): Trade union confederation (КНСБ) (Bulgaria, grade B)
Congress of South African Trade Unions: South African trade union federation (South Africa, grade B)
Alþýðusamband Íslands (ASÍ) (Iceland, grade B)
CSB (Central dos Sindicatos Brasileiros) (Brazil, grade B)
CTB (Central dos Trabalhadores e Trabalhadoras do Brasil) (Brazil, grade B)
Força Sindical (Brazil, grade B)
IG Metall: Metalworkers trade union (Germany, grade B)
Intersindical (Central da Classe Trabalhadora) (Brazil, grade B)
NCST (Nova Central Sindical de Trabalhadores) (Brazil, grade B)
Pública Central do Servidor (Brazil, grade B)
UGT (União Geral dos Trabalhadores) (Brazil, grade B)
AFSCME Oregon: Public employees' union (United States, grade B)
AFT Oregon: Teachers' union (United States, grade B)
All India Central Council of Trade Unions: Central trade union (AICCTU); signatory of the joint pre-budget memorandum of 24 (India, grade B)
All India Trade Union Congress: Central trade union (AITUC); signatory of the joint pre-budget memorandum of 24 (India, grade B)
All India United Trade Union Centre: Central trade union (AIUTUC); signatory of the joint pre-budget memorandum of 24 (India, grade B)
Arbeitnehmerkammer Bremen: Chamber of employees (Bremen) (Germany, grade B)
Arbeitskammer des Saarlandes: Chamber of employees (Saarland) (Germany, grade B)
Asociación Nacional de Empleados Fiscales: Campaign organiser (Chile, grade B)
Asociación Nacional de Funcionarios de Impuestos Internos de Chile: Campaign organiser (Chile, grade B)
Asociación de Fiscalizadores de Impuestos Internos de Chile: Campaign organiser (Chile, grade B)
Bandalag starfsmanna ríkis og sveitarfélaga (BSRB) (Iceland, grade B)
Blocul Național Sindical: Trade union confederation (Romania, grade B)
Bukluran ng Manggagawang Pilipino (Philippines, grade B)
CGT San Nicolás: Local union confederation (Argentina, grade B)
CGTB (Central Geral dos Trabalhadores do Brasil) (Brazil, grade B)
CNTE (Confederação Nacional dos Trabalhadores em Educação) (Brazil, grade B)
CNTSS (Confederação Nacional dos Trabalhadores em Seguridade Social) (Brazil, grade B)
CSP-Conlutas (Brazil, grade B)
CTA San Nicolás: Local union confederation (Argentina, grade B)
CUPE Ontario: Provincial union division (Canada, grade B)
Canadian Labour Congress: National labour confederation (Canada, grade B)
Central Obrera Boliviana: National trade union confederation (Bolivia, grade B)
Central Unitaria de Trabajadores (CUT) (Colombia, grade B)
Central Unitaria de Trabajadores de Chile: Campaign organiser (Chile, grade B)
Central de Trabajadoras y Trabajadores de la Ciudad y el Campo: Labour organisation (Mexico, grade B)
Centre of Indian Trade Unions: Central trade union (CITU); signatory of the joint pre-budget memorandum of 24 J (India, grade B)
Chicago Teachers Union: Illinois union (United States, grade B)
Committee of Interns and Residents / SEIU: National union of resident physicians and fellows (United States, grade B)
Communications Workers of America: Union (United States, grade B)
Confederación General de Trabajadores del Perú: Trade union confederation (Peru, grade B)
Confederação Geral dos Trabalhadores Portugueses – Intersindical Nacional: Trade union confederation (CGTP-IN) (Portugal, grade B)
Confederația Sindicală Națională Meridian: Trade union confederation (Romania, grade B)
Confetam (Confederação dos Trabalhadores no Serviço Público Municipal) (Brazil, grade B)
Conseil des Lycées d'Algérie: Autonomous secondary-school teachers' trade union and member of the Intersyndica (Algeria, grade B)
Contra Costa Defenders Association: Public-defender employees’ association (United States, grade B)
Contraf-CUT (Brazil, grade B)
Cook County College Teachers Union Local 1600: Illinois union (United States, grade B)
Coordinadora Nacional de Sindicatos Universitarios de Educación Superior, Investigación y Cultura: University and research unions coordination (Mexico, grade B)
Coordinadora Nacional de Trabajadores de la Educación: National teachers’ union coordination (Mexico, grade B)
Deutsche Steuer-Gewerkschaft: Union of tax officials (Germany, grade B)
EL og IT Forbundet: Trade union for electrical and IT workers (LO affiliate) (Norway, grade B)
Federación Sindical de Trabajadores Mineros de Bolivia: Mineworkers union federation (Bolivia, grade B)
Federation of Free Workers (Philippines, grade B)
Fellesorganisasjonen: Trade union for social workers and educators (LO affiliate) (Norway, grade B)
Fédération de la santé et des services sociaux – CSN: Quebec health and social services federation (Canada, grade B)
Gewerkschaftsbund des Kantons Zürich (GBKZ): Trade union body (Switzerland, grade B)
Handel og Kontor i Norge: Trade union for retail and office workers (LO affiliate) (Norway, grade B)
Hind Mazdoor Sabha: Central trade union (HMS); signatory of the joint pre-budget memorandum of 24 Ju (India, grade B)
Illinois Federation of Teachers: Illinois union (United States, grade B)
Indian National Trade Union Congress: Central trade union (INTUC); signatory of the joint pre-budget memorandum of 24 (India, grade B)
Internacional de Servicios Públicos: Campaign organiser (Chile, grade B)
International Longshore and Warehouse Union Local 10 (United States, grade B)
Intersindical Instrumento de Luta da Classe Trabalhadora (Brazil, grade B)
LO (Landsorganisationen): Swedish Trade Union Confederation (Sweden, grade B)
Labour Progressive Federation: Central trade union (LPF); signatory of the joint pre-budget memorandum of 24 Ju (India, grade B)
Los Angeles College Faculty Guild, AFT Local 1521: Community-college faculty union (United States, grade B)
Nagkaisa Labor Coalition (Philippines, grade B)
New Zealand Council of Trade Unions: National trade union confederation (New Zealand, grade B)
Nueva Central de Trabajadores: National labour federation (Mexico, grade B)
OTEP-SN (Paraguay, grade B)
Organisation Démocratique du Travail: National trade union organisation in Morocco (Morocco, grade B)
Pancyprian Federation of Labour (PEO): Trade union confederation (Cyprus, grade B)
Public Service Alliance of Canada: National public-sector union (Canada, grade B)
Public Services International: International tax-justice campaign supporter (Tanzania, grade B)
SEIU Healthcare Illinois: Illinois union (United States, grade B)
SEIU Local 73: Illinois union (United States, grade B)
SEIU Oregon State Council: Service employees' union council (United States, grade B)
SF Bay Area Federal Unionists Network Hub (United States, grade B)
SUPER Federation (Philippines, grade B)
Self Employed Women's Association: Central trade union (SEWA); signatory of the joint pre-budget memorandum of 24 J (India, grade B)
Sentro ng mga Nagkakaisa at Progresibong Manggagawa (Philippines, grade B)
Sindicato de Trabajadores del Sector Privado (SITRASEP): Private-sector union (Costa Rica, grade B)
Teachers’ Dignity Coalition (Philippines, grade B)
Trade Union Coordination Centre: Central trade union (TUCC); signatory of the joint pre-budget memorandum of 24 J (India, grade B)
Travail.Suisse: Trade union body (Switzerland, grade B)
Turkish Public Services Union (Turkey, grade B)
UNITE HERE Local 11: Southern California local union (United States, grade B)
UNITE HERE Local 30: San Diego local union (United States, grade B)
USO (Unión Sindical Obrera): Member of the Plataforma por la Justicia Fiscal (Spain, grade B)
Unio: Trade union confederation (400,000 members) (Norway, grade B)
Union Générale des Travailleurs Algériens: National trade union confederation of Algeria (Algeria, grade B)
United Trade Union Congress: Central trade union (UTUC); signatory of the joint pre-budget memorandum of 24 J (India, grade B)
Worker House: National Trade Union Confederation of Iran (Iran, grade B)
Zveza svobodnih sindikatov Slovenije (ZSSS) (Slovenia, grade B)
Confederation of Labour Podkrepa: Trade union confederation (КТ „Подкрепа“) (Bulgaria, grade C)
Konfederácia odborových zväzov SR: Slovak trade union confederation (Slovakia, grade C)
MNREGA Mazdoor Union: Rural workers union, Varanasi (India, grade C)
Malawi Congress of Trade Unions: National trade union confederation (Malawi, grade C)
National Hawkers Federation: Network of street vendors and workers (India, grade C)
Non-Academic Staff Union of Educational and Associated Institutions: Nigerian trade union representing non-academic staff in universities, research i (Nigeria, grade C)
Savez sindikata Crne Gore: Confederation of Trade Unions of Montenegro (Montenegro, grade C)