The mayor said the Rampart corruption scandal, which involved members of that LAPD division's anti-gang Community Resources Against Street Hoodlums squad, led the department to "throw the baby out with the bathwater" by killing the units.
"I want us to really get serious and focused and organized about the gang crime problem in the city," Hahn said. "I am not happy about the level of safety in many of the communities in Los Angeles."
In his continuing introduction of his new chief, the mayor expects to attend several events around the city with Bratton next week.
Bratton's first official day on the job also marked the last for acting Chief Pomeroy.
As he prepared to leave, officers and others in Parker Center downtown lined the hallways to the parking lot to bid him farewell. Pomeroy, a popular veteran of the LAPD, came out of retirement to lead the department during the search for the chief, and his departure was a sad event for many of his longtime colleagues.
Those in the halls Friday afternoon included the department's highest officials, as well as rank-and-file members and civilians. It was the first such farewell since former Chief Daryl Gates' departure, according to several Parker Center officers.