JCB, the Cleveland/Pittsburg war did not start till the late 70's, but both families were having conflicts with each other beginning in the mid 60's.

Lanza was a powerhouse family boss. I did not mention him as, this topic was asking, Defunct Families-who was the strongest? With everything combined, not only the boss, but the other family members and territories it held as well as what they were able to earn.