The Great Treasure Hunt (1972)

After committing a robbery, Sam is about to be hanged. His brother Dean contacts a Frenchman (former expert in explosives) and his attractive niece (a poker player). The three put on a scheme to make a bank robbery, just in time to disrupt Sam's hanging, and free him, too. In turn, the four are hired by Felipe, a blind Mexican interested in art painting, namely some paintings that are kept by the military dictator, El Supremo. The task would be difficult already, but it's worth as the two brothers weren't fighting each other for whatever reason, and if everybody had not ulterior motives for their acts.