Thanks for the question. And thanks for turning to Washington City Paper instead of Google for your answer. Had you used the world’s most popular search engine, the first response would have been the thoroughly researched article, “Why Hasn’t the Mafia Ever Made Inroads in D.C.?” by The New Republic’s Bradford Plumer. Short answer: D.C. never attracted a sizable Italian population. No Italians = no mafia. Although don’t forget about Sal Cottone, a mafioso who had a reasonable level of local criminal success until the feds arrested him in 1990.
Why is there no mafia in D.C.?