In these functions, Langbein brought the concentration camp crimes to public notice and fought for compensation for former concentration camp victims. He was excluded from KPÖ in 1958 when he started—in the wake of the Hungarian Uprising of 1956—to challenge Stalinism.
Langbein's actions in these positions focused on exposing the abuses at concentration camps and seeking compensation for those who endured them. His departure from KPÖ in 1958 was a result of his growing opposition to Stalinism, which was sparked by the 1956 Hungarian Uprising.