Labor-Progressive Party

In January 1946, Parent announced he was breaking with the "reactionary" Liberals and sat the remainder of his term in the legislature as a Labour representative while voting with LPP MPPs MacLeod and Salsberg.

The LPP had strong pockets of support in working-class neighbourhoods of Montreal, Toronto and Winnipeg as well as in the Crowsnest Pass mining region of Alberta and British Columbia[1] elected a number of its members to local city councils and school boards.

In Toronto, Charles Simms and Norman Freed served as aldermen while Smith was elected to the city's powerful Board of Control.

[13] She played a significant role in the Stelco Strike of 1946, and paid for her stances in the 1947 election, being shut out of the 4-person body after receiving the second highest number of votes in 1946.

[15] Dr. Harry Paikin was elected a school trustee on the Hamilton Board of Education in 1944 and remained in office for three decades, until his death in 1985,[16] including ten years as chair.

The LPP faced repression during the Cold War as anti-Communist sentiment increased in Canada, particularly after the revelations of Igor Gouzenko following his defection from the Soviet embassy in Ottawa.

Aggravated as well by revelations of widespread antisemitism in the Soviet Union (a serious blow to Jewish members of the LPP such as Salsberg and Robert Laxer), the party underwent a serious split with more than half of its membership including many in the leadership, including Salsberg, Stewart Smith, Harry Binder, Sam Lipshitz and other prominent LPP leaders, ultimately leaving with the remaining party being a remnant of what it once had been.

The NFLY was renamed the Socialist Youth League of Canada in the 1950s but became defunct later in the decade due to internal party turmoil.