Columbia Pictures' The Mad Magician starred Vincent Price and was released in 1954. In the film, Price plays illusion designer Don Gallico, a frustrated magician who's indentured to a slaving employer, Mr. Ormond (Donald Randolph). Injuncted by his boss to stop practicing magic and stick to slaving in the workshop, Price hatches a nasty scheme to get rid of his tormentor and a fellow magician.
Patrick Oneal and Eva Gabor co-star, and The Mad Magician is an entertaining murderous romp behind the scenes of music hall magic of the early 20th century. Price, as you may imagine, is not the hero of this piece. You can order a couple of repro posters for the film.
And you can watch it in it's entirety on Youtube! Good thing, as it's not available on DVD.