The Left Socialst Party appeared too late to qualify as one of the original parties in Janda's 1950-1962 ICPP study. It continued to1990 and qualified for the Harmel-Janda study of party change.

The essay on party politics in Denmark from 1963 to 2000 says:

The VS emerged at the end of 1967 as a splinter group from the Socialist People's Party (SF). The SF, after suffering from internal dissention over cooperation with the Social Democrats (SD), finally split in the waning days of 1967, with a third of the SF delegation turning the balance to bring down the Government. After a special party congress, the "right wing" of the party held a fractional majority, and the left wing walked out and formed the VS. Quickly mobilizing, they succeeded in getting on the ballots for the January 1968 elections, though the party never managed to obtain more than two or three percent of the seats in the legislature. In a symbolic attempt at ideological purity, the VS took the original name of the Communist Party (DKP) before it was changed after joining Comintern. Though the VS had not been directly represented in the legislature after failing to obtain the two percent minimum in the 1988 elections, it has resurfaced as part of the Red-Green Unity List (Enhedslisten-de Rød-Grønne--ERD), composed of the VS, DKP, and the Socialist Workers‚ Party. The ERD has taken three percent of the seats in two successive elections, in 1994 and again in 1998.

Consult the index to variables for annual scores of the party's issue orientation, organizational complexity, centralization of power, and coherence from 1950 through 1990.