Actually the movie's portrayal of Woltz was tame compared to the novel.
"You don't understand. Johnny Fontane never gets that movie. That part is perfect for him. It'll make him a big star. I'm gonna run him out of the movies. And let me tell you why. Johnny Fontane ruined one of Woltz International's most valuable proteges. For three years we had her under contract, singing lessons, dancing lessons, acting lessons. I spent hundreds of thousands of dollars. I was gonna make her a big star. And let me be even more frank, just to show you that I'm not a hard-hearted man, that it's not all dollars and cents. She was beautiful! She was young, she was innocent. She was the greatest piece of ass I've ever had, and I've had 'em all over the world."
Actually the movie's portrayal of Woltz was tame compared to the novel.