Sam Spade turns 75!

Cortez writes “”The Maltese Falcon” was released 75 years ago on Valentine’s Day. Dashiell Hammett lived every bit as hard as Sam and paid the price:
Says SFGate.com:
He would definitely have trouble in today’s world: “The things Hammett saw as a Pinkerton operative also helped make him a Marxist. A distinctly American Marxist. He was an upbeat, patriotic man who enlisted in the Army during both world wars and stuck to the ideals of equality and justice, despite the going-over he got from the government during the commie witch hunts of the early ’50s, when he was jailed and blacklisted.”
For 25 bonus points how many actors have played Sam and in what films?”