During the Holocaust in Hungary, Kun was also the commander of an Anti-Semitic death squad for the Arrow Cross Party.
[2] Although it is uncertain whether he ever had valid faculties, Kun sometimes gave sermons and offered Nuptial Masses at Sacred Heart of Jesus Roman Catholic Church in Városmajor.
His squad massacred the remaining Jews who were not only in the official Budapest Ghetto but in hospitals, homes for the elderly, houses that belonged to neutral states such as Switzerland and Sweden.
"[4][2] In a later interview with journalist Rezső Szirmai, Kun recalled, "I always wanted to reduce human misery and suffering.
Ernő Ligeti and his wife were killed on the spot, but their son Károly survived four bullets, recovered from his wounds, and later emigrated from Hungary.
On another occasion, men under Kun's command broke into a sanatorium, where 100 Jewish patients were shot to death.
[7] Kun helped local squads to move and escape to Buda and he put his headquarter back to the XII.
At the end, even the official Arrow Cross government authorities (Nemzeti Számonkérő szék[8]) were fed up with his atrocities (he started attacking premises under the protection of the neutral countries, especially Switzerland and Sweden).
Eventually, 60 police officers surrounded his headquarters and then issued an ultimatum: if Kun and some of his companions were not produced within 10 minutes, a machine gun attack would be launched to occupy the building.
[10] Among the charges he faced were beating Lieutenant Colonel Rezső Mindák, as well as severely abusing a section of police officers.
In the interview, Kun admitted to beating Jews, but denied killing anyone and claimed to have been falsely convicted.
[14] In his bestselling history of the Siege of Budapest, Hungarian historian Krisztián Ungváry describes Kun's crimes in detail.
In the process, however, he also comments that, while Kun and his unit were massacring Jews, the Papal Nuncio to Hungary, Angelo Rotta, was working closely with Raoul Wallenberg and other neutral diplomats and helped to save tens of thousands of Jewish lives.