Pirates of Blood Island (1972)

Former pirate chief MacDonald has gone to England and won amnesty for his band of buccaneers, promising to reform them into peaceful colonial ways. But what follows is an engaging and ruthless tale of deceit and treachery as MacDonald faces ruin due to traitors who plot to overthrow him and seize Blood Island whose waters contain a valuable treasure.

Unfortunately the movie Pirates of Blood Island is not yet available on HBO Max.