In 1961, Hanan and nine other National MPs (Ernest Aderman, Gordon Grieve, Duncan MacIntyre, Robert Muldoon, Herbert Pickering, Logan Sloane, Brian Talboys, Mrs Esme Tombleson and Bert Walker) crossed the floor and voted with Labour to abolish the death penalty for murder in New Zealand.
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In 2005 and 2006 five Democratic Party members changed parties; four members crossed the floor to the MPRP, whilst the Deputy Chairman (Lamjavyn Gündalai) began a new party (the People's Party).
The Alliance gained its first Member of the Legislative Assembly of Alberta (MLA) on June 29, 2004, when Gary Masyk crossed the floor, quitting the Progressive Conservative Party to protest Ralph Klein's handling of health care issues during the 2004 federal election.
On 20 October 2010, Fazio was suspended from the Labor Party when she crossed the floor to vote with the NSW Greens on a bill dealing with the distribution of X-rated pornography.
In 2006, Liberal support in this region melted; the only non-Conservative elected in this region was Belinda Stronach, a former Conservative who crossed the floor in 2005.
The party had briefly picked up its first Quebec MP in 1986, when Robert Toupin crossed the floor from the Tories after briefly sitting as an independent.
Thorsteinson's new party gained momentum immediately following the 2004 federal election when Edmonton Norwood Member of the Legislative Assembly (MLA) Gary Masyk crossed the floor to join the Alberta Alliance, and bring Alberta Alliance representation into the legislature.
He served as mayor of Mississauga from 1976–1978, and remains active in local Conservative politics, being highly critical of Tim Peterson's installation as the Progressive Conservative Party of Ontario candidate in 2007 after crossing the floor, remarking that the process was "a violation of the democratic principles the Conservative Party has stood for over the years".