The Comedian (1957)

Sammy Hogarth, a vaudeville comedian who now has his own TV show, is a ruthless egomaniac who demands instant obedience from his staff and heaps abuse on those in lesser positions than he is. His most vituperative behavior, however, is reserved for his weak-willed brother, Lester, who Sammy has hired as his assistant but who really uses him as his whipping boy.