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.
In these capacities, Langbein shed light on the wrongdoings at concentration camps and sought redress for former camp inmates. He was ousted from KPÖ in 1958 when he began questioning Stalinist authority, following the 1956 Hungarian uprising.