The Pierre endured a $3 million (worth $27million today) hotel robbery on January 2, 1972, by Samuel Nalo and Robert Comfort "Bobby Comfort" an associate of the Lucchese Crime Family, Christie 'the Tic' Furnari, and carried out by several of his Gang burglars. This robbery would later be listed in the Guinness Book of World Records as the largest, most successful hotel robbery in history.

The date of the robbery was perfect. Most of the hotel's guests were soundly sleeping off their escapades from the previous New Year's Eve extravaganzas, which they had attended wearing their finest jewels. The jewels were kept in safety deposit boxes downstairs until more secure bank vaults re-opened at 9:00 that morning. Also, because of the holiday, the hotel had only a skeleton crew, including guards.

The entire robbery took two and a half hours. Within that time Bobby and Robert were able to break into close to one quarter of the 208 lock boxes in the vault. At 6:15, Bobby Comfort informed the hostages that they were leaving and to not tell the police if they were able to identify anyone or they would be murdered. Before departing Comfort gave a $20 bill to each hotel employee that they had detained, except for the security guards, and they all left at 6:30, just ahead of the hotel's incoming 7:00 a.m. shift

More Info: en.wikipedia.org