Although the American Mafia has been "decidedly diminished from decades ago" veteran reporter Jerry Capeci believes it remains "a force to be reckoned with" as reported by Clyde Haberman for The New York Times.
Of course, good luck convincing law enforcement that the Mafia persists as government resources are misdirected to operate stings against wannabe terrorists found in chat rooms who otherwise were no credible threat against the country until some undercover agent manufactured the supposed opportunity.
Indeed, Trevor Aaronson, the author of The Terror Factory: Inside the FBI's Manufactured War on Terrorism, claims that most of the terror plots supposedly foiled by the FBI were never genuine threats but only manufactured stings as reported by Joshua Holland for Salon: "in the 10 years after 9/11, there were a little more than 500 defendants who were charged with federal crimes involving international terrorism," and only five of them "were involved in some sort of plot that either had weapons of their creation or their acquisition or were connected to international terrorists in some way."
These days the G-men would be hard-pressed to bring a mob case even if it fell into their proverbial laps.
Further reading that may be of interest: