In the French-speaking part of Switzerland the members of the party come mainly from the Swiss Party of Labour, solidaritéS, Les Communistes and independents.
Lechleiter served as the Zurich canton secretary of the Swiss Party of Labour between 1945 and 1956, and as national secretary of the party between 1966 and 1978 (as part of a triumvirate along with Jean Vincent and André Muret).
Holding two seats in the Swiss National Council (lower or first chamber of the Swiss parliament), going into the 2007 elections, the party stood candidates in the cantons of Zürich, Vaud, Geneva and the Ticino on their own, and in Neuchâtel the candidate was on a joint list with Solidarity.
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While the share of the vote in 2007 was similar to the party's 2003 results (0.7%), the party lost the seat held by Josef Zisyadis, while retaining the seat held by Marianne Huguenin.
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In 2007, the Ticino section voted to change the cantonal party's name back to the earlier Partito Comunista.
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Zisyadis since the founding of the new party Alternative Left in 2010 is a member of that party, but also stays member of the Swiss Party of Labour.