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Dear Kobo Akatchi,
Thank you for contacting the History Hub!
To respond to your question, you will need to investigate the leader you listed. We suggest that you begin by exploring the Marcus Garvey’s papers at the University of California - Los Angeles African Studies Center; the papers of W.E.B. duBois at the University of Massachusetts Amherst Library Special Collections and Archives; the papers of James Weldon Johnson at Emory University Stuart A. Rose Manuscript, Archives, and Rare Book Library; and the papers of A. Philip Randolph at the Library of Congress
Other collections that may be of interest are the records of the NAACP housed at the Library of Congress and the Universal Negro Improvement Association and African Communities League (UNIA-ACL) at UCLA.
We hope this information is helpful. Best of luck with your research!