The United States began registering men for the draft well before the Japanese bombed Pearl Harbor (it's like they knew something was coming on the horizon). After all, you don't want to go to the mattresses without the men and material necessary to win a war. The U.S. needed men and guns, but somehow, the heads of New York's Five Families managed to avoid it.
While there were a lot of men associated with the mafia who fought in World War II, the guys at the top (many of which who were still the prime age for selective service) did not. It wasn't about their connections; they had a legitimate reason to stay stateside.
Maybe the draft letters got lost in the mail. I dunno. Probably.
It has nothing to do with patriotism. If you consider the idea of pure capitalism, no one could possibly be more pro-America than the wiseguys who played the system to their advantage. Besides, the mafia was no fan of Mussolini. In Italy, the dictator was going to war with mafioso families in Sicily, men he considered a direct threat to his regime.
Back in the United States, members of New York's crime families did join the military to fight in the looming World War. Matty "The Horse" Ianniello, who would one day be the acting boss of the Genovese family, served in the Army. The Genovese's George Barone was one of the family's most feared hitmen, but before that, he was in the Navy fighting on Guam, Saipan, Leyte, Luzon, and Iwo Jima. The Bonnano family's "Johnny Green" Faraci landed at Normandy on D-Day.
But their bosses were absent.
"In this suit? Fuggedaboudit."
But there was a reason, and that reason didn't include intimidating selective service officials or beating the unholy crap out of draft boards. Some of the wiseguys at the top of New York's five families were still (mostly) of draft age. Though many of the fathers at the top were just a hair older, even Bonanno family father, Joe Bonanno, was eligible for the draft. But these guys weren't just running numbers, prostitution, and carjacking rings; they also ran legitimate businesses. Basically, they still needed a legitimate income, they just had the best marketing and growth plans every business owner dreams about.
In his autobiography, Joseph Bonanno talked about what happened to the mafia during the war, albeit very briefly. He mentioned for his part, he managed to avoid being drafted because one of his legitimate businesses was a large dairy operation in upstate New York – which was considered an industry vital to the war effort, and thus kept his name off the draft rolls.
"Whatsa matter? You don't like farming?"
Mafiosos famously controlled labor unions across the United States and, as a result, were considered essential members of key war production industries, including concrete construction, harbors, and the Teamsters unions. What would become the Genovese family got its start laundering money through extensive fishing operations. This became an especially powerful way to avoid the draft in the 1970s, where the Mafia reached the peak of its power in the United States.
This work was known as a "reserved occupation" and included dock workers, farmers, scientists, railway workers, and utility workers. Joseph Bonanno was just your average crime family father, and a simple dairy farmer.