Who Killed Carlo Tresca?

It has been 40 years since Carlo Tresca was gunned down on the streets of New York, at 5th Avenue and 15th Street (January 11, 1943). Who killed him? Mussolini’s Fascists? The Stalinists? Mafioso hirelings working for either (Genovese hit men?), or those Tresca called “ex-Fascists”?

Immediately after the murder, then New York District Attorney Frank Hogan and the police launched an active investigation. There were leads a-plenty, clear lines of investigation—and, th...