He was set free by the Red Army occupying Romania on August 28, 1944, and benefited from a general amnesty. In October, Nicolschi was incorporated into the police force, becoming an inspector, while, in parallel, he rose rapidly through the ranks of the PCR. In May 1945, just after the end of World War II in Europe, he was present in Moscow, where he was entrusted with the task of transporting Ion Antonescu and his group of collaborators (Mihai Antonescu, Constantin Pantazi, , and others, all of whom had been captured by the Soviets) from Lubyanka back to Romania. On April 9, 1946, it was he who signed the release papers when these prisoners were taken back to Romania by Soviet Lieutenant Colonel Rodin to face trial.