Abbreviations
| AFL |
American Federation of Labor |
| Casa |
House of the World Worker – Casa del Obrero Mundial |
| CGT |
General Confederation of Workers – Confederación General de Trabjadores |
| CLP |
Communist Labor Party |
| COM |
House of the World Worker – Casa del Obrero Mundial |
| CPA |
Communist Party of America |
| CPPA |
Conference for Progressive Political Action |
| CPUSA |
Communist Party of the United States of America |
| CROM |
Regional Confederation of Mexican Workers – Confederación Regional de Obreros Mexicanos |
| CTRM |
Confederaton of Workers of the Mexican Region – Confederación de Trabajadores de la Región Mexicana |
| FLP |
Farmer Labor Party |
| FSODF |
Federation of Union of Workers of the Federal District |
| FSORM |
Federation of Unions of Workers of the Mexican Republic – Federación de Sindicatos Obreros de la República Mexicana |
| IAM |
International Association of Machinists (US) |
| ISR |
International Socialist Review |
| IWW |
Industrial Workers of the World, Wobblies |
| KRESINTERN |
Communist Peasant International |
| LCAEV |
League of Agrarian Communities of the State of Veracruz – La Liga de Comunidades Agrarias del Estado de Veracruz |
| SPA |
Socialist Party of America |
| Wobblies |
Members of the Industrial Workers of the World |