Parker Brothers is presented in the source material as the major toy company at the center of the commercialization and rights management of Monopoly. In 1935, when Charles Darrow brought his Atlantic City version of the game to the company, Parker Brothers turned it into a marketable product and simultaneously built a powerful success narrative: the story of an unemployed man who invented a dream game alone in his basement to support his family. This narrative was included in the game box and helped elevate Darrow as a celebrated millionaire entrepreneur in game design.
The sources also state that Parker Brothers knew Darrow was not the sole inventor and that similar games and patents had already existed. To secure exclusive rights, the company approached Lizzie Magie in November 1935 and offered her a flat $500 payment with no royalties in exchange for her patent rights. When it published a new edition of The Landlord's Game, the company allegedly removed much of the land-value-tax rule that Magie considered essential, gave it little promotion, and quickly let it go out of print. Magie’s name was also erased from Monopoly packaging.
Parker Brothers later became the defendant in the 1970s legal battles led by Ralph Anspach, who was sued for trademark infringement after releasing Anti-Monopoly. Those proceedings helped establish that the term Monopoly and the game system were not inventions of Parker Brothers or Darrow, but had existed earlier as public-domain folk games. In the account provided, the company’s appeal was ultimately rejected by the U.S. Supreme Court in 1983, reinforcing Lizzie Magie’s status as the true original creator.