All Floor Crossings

Roch La Salle, a Progressive Conservative MP from Joliette in Quebec, briefly sat as an Independent in the early 1970s during a dispute with PC leader Robert Stanfield. La Salle…

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…

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…

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.

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 …

Knox, elected as a Liberal-Unionist in 1917, joined the growing Progressive movement in 1919 as prairie farmers organized politically against the traditional parties.

The Conscription Crisis of 1917 shattered the Liberal Party along linguistic and regional lines. When Prime Minister Robert Borden introduced the Military Service Act to impose …

John Costigan

1900Notable

Liberal-Conservative → LiberalMPNew Brunswick

3/5

John Costigan had served as a Conservative MP for over 30 years and had been a cabinet minister under four Conservative prime ministers — John A. Macdonald, John Abbott, John Th…

Newton LeGayet MacKay

1873

Conservative → LiberalMPNova Scotia

3/5

MacKay, Conservative MP from Cape Breton, crossed to the Liberals in 1873 during the Pacific Scandal crisis that brought down John A. Macdonald's government.

When Joseph Howe negotiated better terms for Nova Scotia and joined the federal cabinet, 14 remaining Anti-Confederate MPs followed suit, joining the Liberal-Conservatives or Li…