In 1947 he was arrested, charged with war crimes, tried and convicted by the People's Court, and jailed for nine years.
He served this sentence in Budapest, Vác and Tatabánya (in a "mile work camp"), and was freed in 1956.
On 1 December 1956, with his former jail fellows, he founded the emigrant newspaper Nemzetőr (Nation's guard), published in Munich.
Tollas denied involvement in war crimes, but continued to espouse extreme right-wing views for the rest of his life.
[1] He was one of the few surviving emigres of 1956 when Soviet troops left Hungary in 1990-91, and was able to return home permanently.