OK… lets start with the Wikipedia definition of Jack Thompson:
John Bruce “Jack” Thompson (born July 25, 1951) is an American attorney and activist, based in Coral Gables, Florida. Thompson, a Christian conservative[1], is known for his public advocacy of conservative Christian moral standards. He is also an activist against video games such as Grand Theft Auto and Bully.
His involvement with music, gaming, and the media (and especially use of legal threats) have raised questions about First Amendment rights. The Florida Bar is currently seeking sanctions against Thompson for inappropriate conduct.
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