Czech Republic who escaped the occupation and joined the RAF during the Second World War, returned after the war as heroes and were then mistreated badly by the communist authorities when they took over.
In Poland I believe 2 years ago they were digging up roads and paths at military bases and finding remains of people who had been executed in late 1940's and then buried late at night under paths and roads. Many would have been those who served in Allied forces during the war and when they returned were picked off by Communists.