All Floor Crossings

Robert N. Thompson

1968

Social Credit → Progressive ConservativeMPAlberta

4/5

Thompson, former national leader of Social Credit, crossed to the PCs after the Social Credit Party fragmented and lost relevance federally.

Bud Olson

1967Notable

Social Credit → LiberalMPAlberta

5/5

Olson, MP for Medicine Hat, left the declining Social Credit Party to join the Liberals under Pierre Trudeau, who offered him a cabinet position.

René Lévesque, the charismatic former journalist and Quebec Liberal cabinet minister, had become increasingly convinced that Quebec needed sovereignty to protect its language, c…

Gilles Grégoire

1966Notable

Ralliement des créditistes → IndependentMPQuebec

3/5

Gilles Grégoire, a founding member and key organizer of the Ralliement des créditistes (the Quebec wing of Social Credit), was expelled from the party around 1966 after clashing…

Léon Balcer

1965Notable

Progressive Conservative → IndependentMPQuebec

0/5

Léon Balcer, one of the most senior Quebec Progressive Conservative MPs and a former cabinet minister under John Diefenbaker, left the PC caucus in 1965 over what he saw as the …

Rémi Paul, a Progressive Conservative MP from Quebec, left the PC caucus around 1965 as part of the broader Quebec Conservative revolt against John Diefenbaker's leadership. Lik…

Ouellet and Girouard, Social Credit MPs from Quebec, left the fragmenting Social Credit party to join the Progressive Conservatives.

Thirteen Quebec-based Social Credit MPs, led by Réal Caouette, split from the national Social Credit Party to form the Ralliement des créditistes, a Quebec-focused populist part…

Hazen Argue

1962Notable

NDP → LiberalMPSaskatchewan

4/5

Argue ran to be leader of the new NDP but lost to Tommy Douglas. Bitter about the loss, he crossed to the Liberals.

Ross Thatcher

1955Notable

CCF (socialist party) → IndependentMPSaskatchewan

3/5

Thatcher was a socialist MP, but over time his views shifted dramatically to the right. He left the CCF because he no longer believed in their policies.

Sam Drover

1955Notable

Liberal → CCFMHANewfoundland

0/5

Drover left the Newfoundland Liberal Party to become the province's first Member of the House of Assembly representing the CCF (predecessor to the NDP).

Rolston, a BC Progressive Conservative MLA, crossed the floor to join W.A.C. Bennett's new Social Credit government.

Greenlay, a Manitoba PC MLA, crossed the floor to join the Liberal-Progressive government of Douglas Campbell, who was a childhood friend. He was immediately appointed Provincia…

In late 1944, when Mackenzie King finally implemented limited conscription for overseas service (the "Zombies" crisis), several Quebec Liberal MPs broke with the party to sit as…

Maxime Raymond

1943Notable

Liberal → Bloc populaire canadienMPQuebec

0/5

Maxime Raymond, a veteran Liberal MP from Quebec, founded the Bloc populaire canadien in September 1942, breaking decisively with the Liberal Party over Prime Minister Mackenzie…

Édouard Lacroix

1943

Liberal → Bloc populaire canadienMPQuebec

2/5

Édouard Lacroix, a wealthy Quebec lumber baron and Liberal MP, joined Maxime Raymond's Bloc populaire canadien in 1943, providing the fledgling party with crucial financial back…

James Samuel Taylor

1937

Co-operative Commonwealth Federation → IndependentMPBritish Columbia

0/5

James Samuel Taylor, the CCF MP for Nanaimo in British Columbia, was expelled from or left the CCF caucus around 1937. Taylor was one of the CCF's earliest elected members, winn…

Ernest Edward Perley, a Liberal MP from Saskatchewan, crossed to the Conservative Party around 1935 during the Great Depression. Like several western MPs, Perley was dissatisfie…

Henry Herbert Stevens

1935Notable

Conservative → Reconstruction PartyMPBritish Columbia

0/5

During the Great Depression, Stevens investigated big companies that were exploiting workers and farmers. His own party tried to stop him. So he left and started his own party.

Thomas Alexander Crerar

1930Notable

Progressive / United Farmers → LiberalMPManitoba

5/5

Thomas Alexander Crerar, the founder and first leader of the Progressive Party of Canada, had resigned the party leadership in 1922 and later sat as a United Farmers of Manitoba…

Agar, Progressive MLA in Saskatchewan, crossed to the governing Liberals as the Progressive movement declined on the prairies.

The Progressive Party of Canada, which had won 65 seats in the 1921 election to become the second-largest party in Parliament, gradually disintegrated during the 1920s as Macken…

Alan Webster Neill, a Progressive MP from Comox—Alberni in British Columbia, left the Progressive Party around 1925 to sit as an Independent. Neill was a committed advocate for …

Baker, Saskatchewan Labour MLA, crossed to the Liberals, joining the governing party.