Question: Who wrote the play that Jack Thompson was the lead actor in 1980?

Context paragraphs:
The Sum of Us (film): The Sum of Us is a 1994 Australian comedy-drama film version of the play "The Sum of Us".  Directed by Kevin Dowling and Geoff Burton, the film starred Russell Crowe and Jack Thompson.  The screen adaptation mimics the play's device of breaking the fourth wall with direct to camera conversational asides by both Harry and Jeff.

Jack Thompson (boxer): Cecil Lewis "Jack" Thompson (August 17, 1904 – April 11, 1946) was an American boxer who twice held the World Welterweight Championship.  Born Cecil Thompson, his name was changed when he decided to become a professional fighter.  His father, who was training him, did not think "Cecil" was a fighter's name, so he chose "Jack."  To avoid confusion with another fighter named "Jack Thompson," his father decided to use the ring name Young Jack Thompson.

A Modest Video Game Proposal: A Modest Video Game Proposal is the title of an open letter sent by activist/former attorney Jack Thompson to members of the press and to Entertainment Software Association president Doug Lowenstein on October 10, 2005.  He proposed that, if someone could "create, manufacture, distribute, and sell a video game in 2006" that allows players to play the scenario he has written, in which the character kills video game developers, he will donate $10,000 to the charity of former Take-Two Interactive chairman Paul Eibeler's choosing.  The title of the letter alludes to Jonathan Swift's 18th century satire essay "A Modest Proposal".

Riptide (Australian TV series): Riptide was an Australian adventure television series, starring Ty Hardin, which was first broadcast in 1969.  The show featured a foreign lead actor and a foreign producer, similar in approach to "The Outsiders".  Co-stars were Jonathan Sweet and Sue Costin, while guest roles featured Australian actors such as Tony Ward, Rowena Wallace, Michael Pate, Bill Hunter, Helen Morse, John Meillon, Norman Yemm, Chips Rafferty, and Jack Thompson.  The series was filmed at Australian locations.

Take-Two Interactive Software, Inc. v. Thompson: Take-Two Interactive Software, Inc. v. John B. Thompson is a lawsuit filed by Take Two Interactive against Miami attorney Jack Thompson seeking to permanently enjoin him from filing a public nuisance suit under Florida law against Take Two to block the sales of the unreleased video games "Grand Theft Auto IV" and "Manhunt 2".  Thompson had previously filed just such a suit against Take Two to block the release of "Bully", which Thompson lost.

Jack Thompson (actor): Jack Thompson, AM (born 31 August 1940) is an Australian actor and one of the major figures of Australian cinema.  He was educated at University of Queensland, before embarking on his acting career.  In 2002, he was made an honorary member of the Australian Cinematographers Society (ACS).  He is best known as a lead actor in several acclaimed Australian films, including such classics as "The Club" (1980), "Sunday Too Far Away" (1975), "The Man from Snowy River" (1982) and "Breaker Morant" (1980).  He won Cannes and AFI acting awards for the latter film.  He was the recipient of a Living Legend Award at the 2005 Inside Film Awards.

The Club (1980 film): The Club is a satirical play by Australian playwright David Williamson.  It follows the fortunes of an Australian rules football club over the course of a season, and explores the clashes of individuals from within the club.  It was inspired by the backroom dealings and antics of the Victorian Football League's Collingwood Football Club.

Jack Thompson (politician): John Thompson DL (27 August 1928 – 21 July 2011), known as Jack Thompson, was a British Labour Party politician - the Member of Parliament for Wansbeck from 1983 to 1997.  Thompson had a lasting achievement to thwart a plan for a nuclear power station on the long and sandy Druridge Bay, east of Widdrington in the county, one of the leading beaches of Northumberland.

Tommy Freeman (boxer): Tommy Freeman (January 22, 1904 – February 20, 1986) became a World Welterweight Boxing Champion on September 5, 1930 when he defeated reigning champion Young Jack Thompson.  He lost the title to Thompson the following year, on April 14, 1931.  Remarkably, the majority of his recorded wins were by knockout, and his losses were few, at under ten percent of his total fights.

The Letter (1982 film): This 1982 television movie, starring Lee Remick, Ronald Pickup, Jack Thompson, Ian McShane and Christopher Cazenove and directed by John Erman.  It is the third film version of the 1927 play of the same name by W. Somerset Maugham.

Supporting paragraphs: Jack Thompson (actor) The Club (1980 film)
Answer: David Williamson