He founded the On Guard Committee for Freedom, which included Amiri Baraka, Archie Shepp, A.B. Spellman and Walter Bowe.
Moreover, Umbra itself had evolved out of similar circumstances: in 1960 a Black nationalist literary organization, On Guard for Freedom, had been founded on the Lower East Side by Calvin Hicks.
Calvin Coolidge | Calvin Klein | John Calvin | Bill Hicks | Calvin Trillin | Calvin College | Calvin | Taylor Hicks | John Hicks (jazz pianist) | Calvin Klein (fashion designer) | Calvin and Hobbes | Seymour Hicks | Calvin Johnson | Scott Hicks | William H. Calvin | Tom Hicks | Stephen G. Hicks | Peggy Glanville-Hicks | Michael Hicks Beach, 1st Earl St Aldwyn | Melvin Calvin | Frederick C. Hicks | David Hicks | Charlie Hicks | Catherine Hicks | Calvin Richardson | Calvin Peete | Calvin Johnson (musician) | Calvin Hill | Bonny Hicks | Bobby Hicks |