Biszu had been detained by police in September 2012 on 11 charges of possession of illegal ammunition and now faces a sentence of life imprisonment. Prosecution for war crimes nearly 60 years in the past was not possible in Hungary until a 2011 law created and passed by the ruling Fidesz-KDNP coalition reversed a statute of limitations on such charges.

Biszku has been formally charged for abetting the shooting and killing of 46 people in Salgótarján on December 8, 1956. Early the following year, Biszku was named to the Socialist Workers Party’s executive committee and as minister of the interior, allegedly ordered dozens of house searches in March 1957. Biszku served in the post until 1961.