Black revolutionaries formed alliances with Asian-American, Hispanic, and Native American groups, one example being the Rainbow Coalition which included groups such as the Black Panther Party, I Wor Kuen (an Asian-American socialist organization), the Young Lords (a Puerto-Rican gang/social movement), and the Young Patriots (a socialist organization mainly composed of poor Appalachian whites). (From Amy Sonnie and James Tracy, Hillbilly Nationalists, Urban Race Rebels and Black Power: Community Organizing in Radical Times (Melville House Publishing, 2011)

Additionally, the Communist Party USA and other socialist parties were multiethnic and in most cases were unconditionally supportive of black liberation (the old Socialist Party of America had internal conflicts on the matter in its earlier days).