LOS ANGELES, Nov. 22 (Xinhua) -- A convicted child sex trafficker from the U.S. state of Colorado was sentenced to 472 years in prison on Tuesday, the longest sentence for a human trafficking case in the history of the United States.

Considered the leader of a human trafficking ring, 31-year-old Brock Franklin was found guilty of 30 charges out of the 34 counts against him this March, including soliciting for child prostitution, sexual assault and kidnapping.

Local KDVR TV reported the indictment showed Franklin recruited young girls and women, and forced them into prostitution. There was physical abuse if they didn't cooperate to sell their services online.

The defense asked for the minimum sentence of 96 years to Franklin, but the judge sent him up for 376 years longer according to request of victims. Three girls and five women cooperated with prosecutors during the case.

According to local media, Janet Drake, representing the Colorado Attorney General's Office, summed up the jolt like so: "a 400-year sentence sends a strong message across the country that we're not going to tolerate this kind of violence to women and vulnerable populations."