Gallo is identified in this old article as a hitman, although I have never found any murders in which he is a suspect. He did however get sentenced to life in prison where he died in the 1990's.

http://news.google.com/newspapers?nid=1314&dat=19790323&id=9j1OAAAAIBAJ&sjid=Ke4DAAAAIBAJ&pg=4452,3986794