Harry "Pittsburg Phil" StraussStrauss is said to have killed around 500 people during his stint as a Murder Inc. employee.
Strauss was a consumate professional as is evidenced by a hit he described that took place in Florida.
He tailed his target for days until the victim entered a movie theater. On the way in, Strauss found a fire axe on a wall in the lobby. He grabbed the axe, walked calmly into the theater, and slammed it into the man's skull. As the theater erupted into a screaming mass of terrified patrons, Strauss screamed and ran out with the crowd acting like just another frightened movie goer.
Fried in the electric chair.