The 1920 elections saw the EISTP win 11 of the 100 seats in the Riigikogu. In 1922 the party was infiltrated by members of the Communist Party, resulting in a power struggle that the Communists won by mid-1923.[1] The right-wing opposition left the party in 1922 and formed the Independent Socialist Workers' Party (ISTP). The May 1923 elections saw the radicalised party reduced to five seats.[3]