He was charged of suspicion of committing war crimes during the suppression of the Hungarian Revolution of 1956, becoming the first and to date only former top-official in Hungary who has been prosecuted because of political role in the communist era.

For six weeks, he functioned as deputy head of the Cadre Department of the Central Leadership of the Hungarian Working People's Party (MDP) in May 1949.

During the 1956 Hungarian Revolution, he recruited local pro-communist armed groups among party members and workers against the rebels in the first days of the popular uprising.

In this capacity, he became known for the severity he showed in suppressing and punishing after the 1956 revolution, which was one of the largest revolt against the communist government in the Eastern Bloc and its Soviet-imposed policies, was defeated.

[4] Biszku, as a hard-line communist, strongly opposed the New Economic Mechanism (ÚGM) which was imposed by the Kádár regime in 1968 and contained "capitalist elements".

In 1972, together with Zoltán Komócsin, and other fellow communists, he became involved in a plot to force János Kádár to resign from virtually all of his public functions in an effort to return Hungary to a more orthodox Soviet-style line.

[6] Skrabski and Tamás Novák presented themselves as members of a non-existent local organization to Biszku, claiming that they intended to make a movie about him, "Márokpapi's famous son".

There, Biszku called the 1956 revolution a "counter-revolution" and added he had not felt any regret or remorse for the death penalties and retaliatory measures.

[10][11] The parliamentary Committee on Culture and Media also supported the screening and the national assembly later adopted a law that historical documentaries in general should not be banned from public showing on grounds of rights to privacy.

[12] The National Assembly adopted a so-called "lex Biszku" bill, which aims to prosecute former leading communist politicians and law enforcement officials who are seen as responsible for the deterring of the 1956 uprising.

He was convicted of ordering security forces to open fire on civilians, killing 49 people, and was sentenced to five years and six months in prison.

The court also ruled, however, that there was insufficient evidence that Biszku as Minister of the Interior and member of the MSZMP's so-called Provisional Executive Committee had issued the order to fire on 49 protesters in Salgótarján in December 1956 or beat up academics in March 1957.

Fruzsina Skrabski, who made that documentary film which brought Biszku's impunity and high pension salary to the surface, said the Hungarian jurisdiction "are awaiting his death [...] to prevent the start of an avalanche [...] with regard to the impeachment of former high-ranking Communist politicians.