In the split, the entire communist parliamentary group, the party's official newspaper, Folkets Dagblad Politiken, and most of the more militant members joined the Kilbom-Flyg faction.

However the criteria for membership were relaxed, the sole remaining criterion was activism in the base level organization.

The Kilbom party merged in 1934 with a break-away group of the Social Democrats based in Gothenburg, led by Albin Ström.

The transformation into SP also marked a break with the previous line of the party towards the Comintern and the Soviet Union.

[clarification needed] As a result of this, in 1940, a group of members that included Albin Ström and Evald Höglund broke away and formed the Left Socialist Party.

The party also published the weekly Sverige Fritt with Holger Möllman-Palmgren as editor and, among others, Annie Åkerhielm as writer.