The social democratic Co-operative Commonwealth Federation formed the official opposition with the only significant opposition caucus ( 14 seats ).

The social democratic Co-operative Commonwealth Federation ( CCF ), led by Ted Jolliffe, was reduced from 34 seats to only 8.

The social democratic Co-operative Commonwealth Federation ( Ontario Section ), led by Ted Jolliffe, formed the official opposition by increasing its caucus from 8 to 21 seats.

The social democratic Co-operative Commonwealth Federation ( CCF ), led by Ted Jolliffe, lost all but two of its previous 21 seats with Jolliffe himself being defeated in the riding of York South.

The social democratic Co-operative Commonwealth Federation ( CCF ), led by Donald C. MacDonald, won one additional seat, for a total of three.

The social democratic Co-operative Commonwealth Federation ( CCF ), led by Donald C. MacDonald, won two additional seats, for a total of five.

The social democratic Co-operative Commonwealth Federation ( CCF ) held the balance of power with eleven seats, and independent Stephen Juba was also elected in Winnipeg.

The social democratic Co-operative Commonwealth Federation ( CCF ) suffered a disappointing loss under new leader Lloyd Stinson, falling from seven seats to five.

The social-democratic Co-operative Commonwealth Federation ( CCF ) left the coalition in 1943, and experienced a surge in popularity over the next two years.

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