He joined the Russian Social Democratic Labor Party (RSDLP) and supported the October Revolution.

There he joined the Lithuanian Socialist Federation of America [lt] and contributed articles to its newspaper Kova.

[2] In June 1917, he moved to Petrograd where he joined the Russian Social Democratic Labor Party (RSDLP).

[3] From September 1919 to the beginning of 1920, he was head of the illegal local office of the Communist Party of Lithuania and Belarus in Vilnius, which was occupied by Polish forces.

[1] In prison again from April 1924 to July 1926, he received an amnesty after the elections to the Third Seimas of Lithuania in which allowed the social democrats to form a coalition government.