Question: What group was tasked with making nuclear weapons in April of 1939, and was sabotaged by the Allied Nations in World War II?
Sentence (from "German nuclear weapon project"): The first effort started in April 1939, just months after the discovery of nuclear fission in December 1938, but ended only months later due to the German invasion of Poland, after many notable physicists were drafted into the "Wehrmacht".
Relevant evidence: Yes