The March on Washington Movement (MOWM), 1941 -- 1946, organized by activists A. Philip Randolph and Bayard Rustin as a tool to produce a mass march on Washington, D.C., was designed to pressure the U.S. government into desegregating the armed forces and providing fair working opportunities for African Americans. When President Roosevelt issued Executive Order 8802 in 1941, prohibiting discrimination in the defense industry under contract to federal agencies, Randolph and collaborators called off the march.

Based on this passage, who organized a march on washington to protest discrimination on july 1 1941? Let's give stream of consciousness first:
The relevant information to answer the above question is: The March on Washington Movement (MOWM), 1941 -- 1946, organized by activists A. Philip Randolph and Bayard Rustin as a tool to produce a mass march on Washington, D.C., was designed to pressure the U.S. government into desegregating the armed forces and providing fair working opportunities for African Americans.
So, the final answer is A. Philip Randolph and Bayard Rustin.