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| Year | Name | Direction | From/To | Category |
|---|---|---|---|---|
| 1919 | George William Andrews | Gained | from Liberal-Unionist | Stood on Principle |
| 1955 | Ross Thatcher | Gained | from CCF (socialist party) | Changed Beliefs |
| 1967 | René Lévesque | Gained | from Quebec Liberal | Changed Beliefs |
| 1971 | Paul Hellyer | Gained | from Liberal | Changed Beliefs |
| 1986 | Robert Toupin | Gained | from Prog. Conservative | Rejected by Everyone |
| 1990 | David Kilgour | Gained | from Prog. Conservative | Stood on Principle |
| 1996 | John Nunziata | Gained | from Liberal | Stood on Principle |
| 2001 | Deborah Grey + 12 others | Gained | from Canadian Alliance | Fought Their Leader |
| 2004 | Carolyn Parrish | Gained | from Liberal | Kicked Out |
| 2008 | Blair Wilson | Lost | to Green Party | Joined New Party |
| 2013 | Brent Rathgeber | Gained | from Conservative | Stood on Principle |
| 2013 | Dean Del Mastro | Gained | from Conservative | Kicked Out |
| 2013 | Maria Mourani | Gained | from Bloc Québécois | Changed Beliefs |
| 2014 | Sana Hassainia | Gained | from NDP | Stood on Principle |
| 2018 | 7 Bloc Québécois MPs | Gained | from Bloc Québécois | Fought Their Leader |