 Arrested that year (since the PCR had been banned in 1924), he went to the Soviet Union upon his release in 1930.He attended the Comintern's International Lenin School (his only ideological training) and was a participant at the Vth PCR Congress, held in Gorikovo near Moscow in December 1931.The Comintern delegates to the congress, Béla Kun and Dmitry Manuilsky, sponsored his election to the PCR central committee.