Hungary–Romania relations
During World War II, Hungary and Romania became allies and participated in the war against the Soviet Union. But after the coup on 23 August 1944 Romania switched sides and fought against Hungary. Consequently, Soviet and Romanian troops invaded Hungary, occupied Northern Transylvania by October 1944 and re-established the Romanian administration in the region in March 1945. The 1947 Treaty of Paris reaffirmed the borders between Romania and Hungary as originally defined in Treaty of Trianon 27 years earlier, thus confirming the return of Northern Transylvania to Romania.
Ștefan Plavăț
Plavăț returned to Timișoara in the first years of World War II, rejoining the Workshops, and becoming a leading member of the local clandestine organisation of the Romanian Communist Party (PCR). As Romania's dictator Ion Antonescu had joined Nazi Germany's invasion of the Soviet Union, Plavăț and others participated in the sabotage of the war production of the Axis. Arrested along other workers of the Workshops in autumn 1942, he was ultimately released due to lack of evidence.