The City has retained Carter Ledyard and other law firms to represent it in connection with federal probes of Mayor De Blasio’s campaign fundraising and a land deal. Partner G. Michael Bellinger and associate Melissa J. Erwin are representing the city in this investigation. Mr. Bellinger is a litigation partner with nearly 30 years of experience in the areas of internal investigations and white-collar criminal defense, as well as complex commercial litigation, securities law litigation, and employment law litigation.