From the NY Times:
Millions of dollars worth of work associated with the new baseball stadiums for the Yankees and Mets was performed by companies that New York City avoids doing business with because of prior allegations of corruption and ties to organized crime.
The roughly $17 million demolition of Shea Stadium, which cleared the way for the new Citi Field in Queens, was largely done by Breeze National Inc., whose vice president, Toby Romano, was convicted on federal bribery charges in 1988 and whom law enforcement officials have identified as having ties to organized crime.
Much of the electrical work at the new Yankee Stadium was done by Petrocelli Electric, a company that since June 2006 has been on a list of contractors that New York City cautions its agencies against using.
In a third instance, the millions of dollars in excavation and cast-in-place concrete work at the new Yankee ballpark was performed by Interstate Industrial, a company that has been barred from doing city work since 2004.
Two of the three contractors, Petrocelli and Interstate, were not paid with city funds. But both the ballpark projects were overseen by the New York City Economic Development Corporation and together received roughly $2 billion in public subsidies.