An admitted pimp from Dorchester has been sentenced to 30 years in prison on sex trafficking charges-- the lengthy sentence is likely intended to send a message to other would-be human traffickers.

28-year-old Raymond Jeffreys used violence and coercion to prostitute dozens of teenage girls, many of whom were single mothers and formerly in foster care.  All, said US attorney Carmen Ortiz, were economically desperate and vulnerable.

The 30-year sentence was within sentencing guidelines, but U.S. District Court Judge Denise Casper told the defendant that she had no hesitation imposing the maximum.

Jeffreys and his co-defendants ran the sex trafficking operation across 13 states, from 2006 to 2014, from Massachusetts to California. Federal authorities say Jeffrey’s guilty plea ends what had literally been a reign of terror against dozens of young girls over an eight year period.