HILLSBOROUGH COUNTY, Fla. - An underground world of slave trade is exposed during a routine traffic stop. For five people found Saturday afternoon, the road to Immokalee is paved with cruel intentions.

21-year-old Kathleen Roberson, Phenix City, AL, was pulled over by Hillsborough County Sheriff's Deputies because her SUV was missing a tag. Five mexican citizens, all of them in the US illegally, were found in the rear cargo area. Deputies say they were being taken to Immokalee as part of a slave trade.

Federal human trafficking charges are pending against Roberson, who is being held without bond.

Another woman,  29-year-old Jessica Roland, also of Phenix City, was arrested on a  cocaine possession charge.

"You can't make a judgement based on appearance, you have to know what you're looking for," said Nola Theiss, Founder of the Human Trafficking Awareness Partnerships, Inc.

Theiss was one of the first to expose human trafficking in Southwest Florida.

The modern day slave-trade that authorities say the busted is the most common form of human trafficking in Collier County. According to Theiss, the most common form in Lee County is sex trafficking.

Roberson may have been stopped before authorities say she could deliver the five slaves to Collier County, but Theiss says they'll be replaced by five more as the crusade against human trafficking continues.

"We say that it's the second largest crime in the world," Theiss said," probably the most accurate number is 12.5 million people are being held in slavery right now.