Is there or has there been any major activity in the Yonkers area such as a crew or simply a soldier with action there?

"One element of the criminal operation was the "Yonkers Club," where the enterprise ran a casino-style gambling club that held poker tournaments and took bets on horse races, according the indictment. Two members of the enterprise working at the Yonkers Club, Mark Maiuzzo and Anthony Zinzi, set fire to a car parked outside a nearby competitor's operation, according to the indictment."

From the recent bust guys up and down the East Coast.

Yonkers is right next to the bronx. Its influenced by the genovese and lucchese families. Orher than ny lcn families, no other region would have any influence whatsoever in yonkers or the general vicinity.
There were a few crews out of yonkers and to this day some still exist.

The Tanglewood boys were also from Yonkers.

Here is a good article on the Tanglewood boys...
http://nymag.com/nymetro/news/crimelaw/features/2527/

That's a very good one indeed, I read it a couple of months ago..