High Quality Content by WIKIPEDIA articles! When the Social Democratic Party of Canada broke away from the Socialist Party of Canada in 1911, many Winnipeg SPC members joined the new organization. The new party`s platform was written by three residents of the city (Richard Rigg, Herman Saltzman and Jacob Penner), and it has been estimated that nearly 20% of the SDPC`s total membership lived in Winnipeg during the early 1910s.