[1] It ran in the September 1920 Folketing elections, winning a single seat taken by Johannes Schmidt-Wodder [de].

[2] The party remained seatless until the September 1953 elections, retaining its seat in 1957 and 1960.

The party returned to run in the 1968 elections, but failed to win a seat.

Between 1973 and 1979 the party was represented in Parliament by Jes Schmidt [da], a candidate elected through an electoral agreement with the Centre Democrats.

After his death in 1979, the agreement between the two parties stopped because the SP proposed a candidate with a Waffen-SS past, thus unacceptable for the CD.