Angela Davis stirred the passions of millions of people around the world, including some of the leading artists of the time. 
In our exclusive clip of the upcoming documentary Free Angela and All Political Prisoners, presented by BET Networks, Jada Pinkett Smith's Overbook Entertainment and Jay-Z, Davis talks about the unusual gift she recieved during a prison visit from jazz icon Nina Simone. 
Davis' sister also talks about the mail she recieved on behalf of Angela during her imprisonment, and how her struggle inspired poets, politicians and citizens across the globe. 
Free Angela Davis and All Political Prisoners hits select theaters on April 5. 

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(Photo: Overbrook Entertainment)