Everyone I know who has been there has come out very impressed at the exhibits and content. They have the barber chair were Albert Anastassia met his demise, Gotti's Jaguar and all kinds Mob and law enforcemnet memorabilia and exhibits. I personally thought it was very well done and informative.
http://themobmuseum.org/?gclid=CJKhuPfV-bYCFYHe4AodP3kAEQ