Who is he?
George Carlin

What did he do?
Alledgedly, at the Sumerfest Festival on Lake Michigan, Carlin used his routine "'The Seven Words You Can't Say on TV." Some families at the event were appalled by the language used in the routine, and filed complaints with the Police. Carlin was then arrested.

When?
July 21, 1972

Charged?
Yep, with disorderly conduct and obscenity. He was released on a $150 cash bail

Sentence?
Unknown, however, the routine was played on the radio and subsequent complaints forced a criminal case. Eventually ending up in the US Supreme Court, the justices ruled that "the government had the right to regulate broadcasts and performances that were deemed indecent but not obscene."
The Carlin-Pacifica First Amendment case is now studied by virtually every law student in America and the seven words can stil not be used on TV- just as well this is online then eh?
The words are: sh*t, p*ss, f*ck, c**t, motherf*cker, c*cks*cker, and t*ts.