Pittsburgh also went into Youngstown to take over when Cleveland had controlled it for years.
It became a war for years and Youngstown became known as "Bomb City" due the bombings during this time.
This war happened at the same time Cleveland was fighting Danny Green.

Pittsburgh came out on top and Cleveland was out. Partly due to most of Clevelands main members winding up in jail, partly because Pittsburgh took out more Cleveland members. There are some good articles written about those years.