Headed by Othon Decker, the Cartel list contested the 1919 general elections, receiving 3% of the vote and winning one seat.
By the 1925 elections it had become the Independent Left (Luxembourgish: Onofhängeg Lénkspartei) under Decker's leadership.
The 1925 elections saw the party's vote share increase to 5% as it won two seats.
[1] Increasing its vote share to 12%, the party won three seats in the Chamber of Deputies.
Following World War II, the party received just 1.6% of the vote in the 1945 elections, winning a single seat.