The first African Liberation Day, May 27, 1972, featured simultaneous demonstrations in Washington,D.C., San Francisco, and the Caribbean that drew a total of sixty thousand demonstrators in support of indigenous rule in Africa. This photo is from the Washington, D.C., demonstration.©Washington Post; District of Columbia Public Library.

Albert Cleage addressing the Walk for Freedom, Detroit, June 23, 1963. Walter P. Reuther Library.

Amiri Baraka, an effective local black power organizer and mobilizer, addresses an audience at Howard University in Washington, D.C., April 25, 1973. ©Washington Post; District of Columbia Public Library.

The Black Panther party’s Revolutionary People’s Constitutional Convention, Washington, D.C., November 1970. ©Washington Post; District of Columbia Public Library.