The first time he committed or instigated a violent act against a priest or religious (1934, for sure, but maybe before then), OR the first time he stole or intentionally destroyed church property (1939, if not earlier), OR the first time he authorized or promoted, or forced an abortion for anyone (Jews and Poles were victimized by forced abortion during the Holocaust), he was excommunicated automatically, according to canon law.
Excommunicating someone who hasn't set foot in a Catholic church for 20+ years doesn't really accomplish much, though.