Monkey Business (1931 film) Chico give opera singer Madame Swempski (Cecil Cunningham). According to Turner Classic Movies' Robert Osborne, a sequel was planned for this film that would continue the gangster theme. During the development of that film, aviator Charles Lindbergh's son was kidnapped and killed by what was believed to be gangsters. The writers quickly shifted gears and based the brothers' next film very loosely on the Marx Brothers' earlier stage show "Fun in Hi Skule", which would evolve into "Horse Feathers". Monkey Business (1931 film) Monkey Business is a 1931 American Pre-Code comedy film. It is the third of the Marx Brothers'
Marx Brothers and the Marx Brothers. Most of the comedians provided their own voices for their animated counterparts, except for Fields and Chico Marx (both had died), and Zeppo Marx (who had left show business in 1933). Voice actor Paul Frees filled in for all three (no voice was needed for Harpo). The Marx Brothers' segment was a reworking of a scene from their Broadway play "I'll Say She Is", a parody of Napoleon that Groucho considered among the brothers' funniest routines. The sketch featured animated representations, if not the voices, of all four brothers. Romeo Muller is credited as having written