Stanley Tucci tells the story of Kathleen Cleaver, a leading light in the short-lived but highly influential Black Panther Party which was founded in Oakland, California.

Kathleen Cleaver and the Panthers were sick of the compromises of the mainstream civil rights movement. Their militant approach influenced many other activists - including San Francisco's increasingly vocal LGBT community.

But for the US government, the Panthers became public enemy number one - and leading figures like Cleaver were forced to flee.

Academic consultant: Dr Ian Scott, University of Manchester

Written and produced by Laurence Grissell