Soviet 1981 commemorative envelope of Kazys Giedrys
From October 1923, he lived in Kaunas, where he joined the Central Committee of the Communist Party of Lithuania (KPL) and continued illegal party work.[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. Giedrys became secretary of the Central Committee of the Lithuanian Red Aid.[2]
He was again arrested after the 1926 Lithuanian coup d'état which brought Antanas Smetona to power. Along with other leading officials of the Communist Party of Lithuania, he was tried by a military tribunal on charges of preparing for a communist uprising and, together with Juozas Greifenbergeris, Rapolas Charnas and Karolis Požela, was sentenced to death. The convicts were shot on 27 December 1926 in the Sixth Fort of the Kaunas Fortress.[4]