リトアニア共産党
Sniečkus was born in 1903, in the village of Būbleliai, near Šakiai. During the First World War, his family fled to Russia where he observed the Russian revolution of 1917. In 1919, his family returned to Lithuania; by 1920 he was already a member of the Bolshevik Party. In the same year, he was arrested for anti-government activities. He was released from prison on bail, but fled to Moscow, and became an agent of the Comintern. In Moscow, he earned the trust of Zigmas Angarietis and Vincas Mickevičius-Kapsukas, and became a member of the Central Committee of the Communist Party of Lithuania. In 1926, the Comintern sent Sniečkus to Lithuania to replace the recently executed Karolis Požėla as head of the banned and underground Communist Party of Lithuania.