In 1933, when he started his studies at the Law Faculty of the Comenius University in Bratislava, he joined the Communist Party of Czechoslovakia (KSČ) which was banned from 1938 to 1945.
Pada tahun 1933, ketika ia mulai studinya di Fakultas Hukum Universitas Comenius di Bratislava, ia bergabung dengan Partai Komunis Cekoslowakia (KSC) yang dilarang dari 1938 ke 1945.