Cotton Comes to Harlem (1970)

The Charismatic black nationalist leader Rev Deke O'Malley is trying to sell the people of Harlem a dream. Invest $100 in his company and live in Africa. But cops Gravedigger and Coffin know all about Deke and his fraudulent schemes that take advantage of the poor and the ignorant and can't wait for a chance to expose him. When a barbecue O'Malley is apparently 'robbed' they get their chance to take him and his cohorts down.