sentences:  The team became the Acme Packersunder the ownership of the Clair brothersand a professional franchise when they joined the newly formed "American Professional Football Association" on August 27, 1921.However, the franchise was revoked by the league at the end of the season when the Packers were revealed to have used college players in a game.As it turned out, the man who told the league of this was George Halas of the Chicago Staleys, who changed their name to the Bears the following year.