This edition of Anti-Monopoly was printed in 1977, in the midst of a legal battle between Ralph Anspach, the game's creator, and General Mills, the parent company to Parker Brothers, which was the the owner of the copyright for the game Monopoly. Anspach was forced to remove the word "Monopoly" from the game's name, but later prevailed in court and the game was reissued (in 1983) under the original name. The cover of this edition contains a notice to consumers explaining the name change and referencing the lawsuit. [Note that the 1977 ("Anti") edition is subtitled "The Trust Buster's Game," while both the preceding and following editions of Anti-Monopoly are called "The Bust-the-Trust Game." Aside from the name and subtitle, the editions are identical.]

See more information at the following:

http://mentalfloss.com/article/61817/board-game-trial-century
http://www.nytimes.com/1983/02/23/business/monopoly-loses-its-trademark.html