From Gotti to Gigante, the names atop today’s Mafia org charts are old ones. But the times have certainly changed for New York’s biggest families—and not for the better. Mob expert Jerry Capeci, who writes the “Gang Land” column for the New York Sun, looks at the state of the four other clans in the city’s infamous Five Families, plus the Newark-based DeCavalcantes. All have bookmaking, loan-sharking, and extortion rackets. The Genovese family and, to a lesser degree, the Luchese family (like the Gambinos) also have viable labor-racketeering endeavors that let them invest and launder their ill-gotten gains in “legitimate”...