Black Hand Really Evil

New York, N.Y. (1909)

4/30/1909: The Black Hand, a predecessor of the Mafia attempted to extort $1000 from a grocery store owner of the first floor of a tenement.  Because he failed to pay, the Black Hand burned the building down, killing eight residents. 

Category: residential

Suicide: no

Cause: extortion

Weapon: arson[1]

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[1] “Black Hand Members Burned Tenement in New York,” Albuquerque Citizen, Apr. 30, 1909, 1.

Not the only such extortion mass murder by them in my database nor even the worst.