During the Civil Rights Era there were radical leftist groups that used the flag. The YPO in Chicago was allied with the Black Panthers. https://en.m.wikipedia.

During the Civil Rights Era there were radical leftist groups that used the flag. The YPO in Chicago was allied with the Black Panthers. https://en.m.wikipedia.org/wiki/Young_Patriots_Organization https://en.m.wikipedia.org/wiki/Young_Patriots_Organization (ditto Southern Student Organizing Committee)