Groucho

"Some people considered Groucho Marx and his brothers thieves. Many comedians who had their start on the vaudeville stage participated in the age-old habit of appropriation and joke stealing. Everybody did it, but the Marx Brothers got caught a few times....Because of their audacity, or perhaps their carelessness, Groucho Marx, his brothers, their writers, and their studios were forced to defend at least three major copyright infringement suits in their careers. It's clear that the Marx Brothers, despite their creative comic genius, relied heavily on he works of others for their success.

By the 1980s, the Marx Brothers' legacy, reputation, and body of work had solidifed to such a degree that they became the plaintiffs behind lawsuits, instead of the targets for them....A Federal court of appeals heard a complaint by Groucho Marx Productions Inc. against a dramatic production company that used likeliness of the Marx Brothers in a Broadway play called A Day In Hollywood/A Night in Ukraine....Groucho Marx Productions tried to enforce a perpetual monoply on the characteristics of its namesake: the painted mustache slick hair, cigar, and glasses. The court ruled against Groucho Marx Productions, but the case remains an example of how valuable the Marx Brothers are as commodites long after they ceased being creators-or borrowers."

This is what Siva said.