I.W.W., California Branch of the General Defense Committee, "Mass Meeting! Protest Against the Strangling of Labor," Walker's Theatre, Los Angeles, ca. 1920-ca. 1929, id1055, Box: 11, Folder: 6. Gilbert G. Benjamin, Jr. Subversive Activities Collection, URB-GGB. Special Collections & Archives. https://findingaids.csun.edu/repositories/2/archival_objects/34889 Accessed June 16, 2026.