The Adventurers (1970)

Nothing has been left out of "The Adventurers".

The wealthy playboy son of an assassinated South American diplomat discovers that his father was murdered on orders of the corrupt president of the country- a man who was his father's friend and who, in fact, his father had helped put into power. He returns from living a jet-set life in Europe to lead a revolution against the government, only to find out that things aren't quite as black and white as he'd assumed.