Isn't it a bit unreasonable to think that over 50 years after the end of the war, even with a terrible economic depression, European countries would not have recovered fully? Germany recovered from WWII pretty speedily, so if that is possible, anything is, really. Given, it had the Marshall plan and a debt erasure, but still.

Communists appeared in Europe only after the Russian Revolution, so I have no idea how things shaped out in PoW. In France, the Communist Party seceded from the SFIO (Socialist Party) in 1920. Without the Russian Revolution, it would probably have taken longer.

Anarchists were done with by the early 1900s. State repression in the last decade of the 19th century had seriously affected them.