Strikes and lockouts--United States.

Primarily correspondence, reports, minutes, newspaper clippings, and broadsides dealing with his activities as a leader in Local 22 (in Series I), as well as his other union and political activities (in Series II). Among the most significant material in the collection is correspondence documenting Zimmerman's activities with the Communist Party in the U.S. and its various factions and splinter groups, as well as other political organizations and figures.

The Charles Zimmerman papers consist primarily of correspondence, reports, minutes, newspaper clippings, and broadsides dealing with his activities as a leader in Local 22 (in Series I), as well as his other union and political activities (in Series II).