Since the program launched in July, Attorney General Barr said more than 500 people have been arrested and 124 people have been charged with federal crimes.
AG William Barr gives Operation Legend update
US AG Barr gives Operation Legend update
Operation Legend has deployed 1,000 federal agents to nine cities, including 400 to Chicago.
In the first five weeks of Operation Legend in Chicago, Barr said murders dropped by 50 percent over the previous five weeks.
RELATED: Operation Legend Chicago targets ex-cons with guns
Operation Legend targets ex-cons with guns
"The bottom line is Operation Legend has played a critical role in cutting Chicago's murder rate roughly in half since before the operation," Barr said.
RELATED: Operation Legend Chicago targets ex-cons with guns
Operation Legend targets ex-cons with guns
The Department of Justice operation involves federal agents conducting large scale, counter-gang investigations involving confidential informants, covert aerial surveillance and dangerous street work, according to officials.