1. Independent Socialist Clubs/International Socialists
  2. Internet Memes
  3. Industrial Armies
  4. Internet Activism and Social Media
  5. International Ladies Garment Workers Union
  6. International Labor Defense
  7. Industrial Unionism
  8. Intercollegiate Socialist Society
  9. International Longshoremen's and Warehousemen's Union
  10. Irish Americans
  11. Italian Federation of The Socialist Party of America
  12. International Association of Machinists
  13. In These Times
  14. Italian Americans
  15. Independent Left Journals, 1970s to 1990s
  16. International Workers Order
  17. International Brotherhood of Teamsters
  18. Industrialisti (The Industrialist)
  19. International Workingmen's Association
  20. International Woman's Day
  21. International Publishers
  22. Industrial Workers of The World Songs
  23. Irish Progressive League
  24. International Woodworkers of America
  25. Industrial Workers of the World
  26. Ignatiev, Noel
  27. Inman, Mary
  28. International Socialist Review
  29. Illinois Woman's Alliance
  30. ICOR