Mayor Michael Bloomberg signed the "Bouncer Bill" into law Wednesday, meaning the city can now shut down nightclubs that fail to perform background checks on their security personal.

The bill was approved unanimously by the City Council last week.

In addition to giving the city the power to shut down clubs that do not comply, the Department of Buildings will also make the security checks a condition of issuing cabaret licenses to the city's 250 or so nightclubs.

The checks are also required for public assembly permits.

"This bill seeks to protect patrons of New York City's clubs and entertainment venues that employ security guards and bouncers by giving our local law enforcement agencies the ability to crack down on establishments that do not comply with state laws," said Bloomberg.

The move follows the recent murders of two young women, Imette St. Guillen and Jennifer Moore, who were both killed after nights out drinking in Manhattan.

A former bouncer at the Falls Bar in SoHo has been charged with St. Guillen's murder. The bouncer at the Falls, Daryl Littlejohn, had a criminal record when he was hired by the bar.