FERGUSON, Mo. The perpetrators of violence who have instigated a response that has filled the air with tear gas the past 10 days are generally not a presence among the demonstrators protesting the death of Michael Brown.

Rather, police and peaceful demonstrators say, the rocks, Molotov cocktails and gunfire directed at police are the product of a small group of young men who gather furtively as darkness falls near Red's Barbeque and the adjoining warren of avenues off Canfield Drive the street where Brown was killed Aug. 9.

St. Louis County Jail records say at least 85 people have been booked for "refusal to disperse" since Aug. 13, the day before the Missouri Highway Patrol took command of the situation.

At least 52 protesters were arrested Monday night into Tuesday morning for refusing to disperse, unlawful use of a weapon and interfering with a police officer, St. Louis County records say.

All had been released, according to jail officials.

Highway Patrol Capt. Ronald S. Johnson calls some of the protesters a "dangerous dynamic in the night." Some of those, he has said, have come to Ferguson from outside the St. Louis area, but most are local.

"There are some outsiders," Johnson told CNN on Tuesday. "There's a lot of people who live here ... we can't just blame it on outside instigators."

Jail records available for those arrested Monday night show that 38 of those arrested were from the St. Louis region, including 15 from St. Louis city.

Fourteen have addresses outside the region including Chicago; Des Moines, Iowa; New York City; Huntsville, Ala.; Washington, D.C.; and San Diego.

"We continue to worry about folks who are coming in from outside who are using this," Missouri Gov. Jay Nixon told the St. Louis Post-Dispatch on Tuesday.

The governor said the state is working with intelligence experts on the matter and is in contact with the FBI.

"What started as a peaceful protest has been attracting bad guys across the country," he said.

Brian Houston, co-director of the Terrorism and Disaster Center at the University of Missouri-Columbia, predicted Ferguson has not seen the last of what officials characterize as "outside agitators."

"The longer trouble goes on in Ferguson the more time people have to come to St. Louis to cause the trouble," Houston said.

Among those arrested were New York City residents Carl Dix, a member of the Revolutionary Communist Party, and Travis Morales, who identifies himself as a party supporter.

Reached by phone Tuesday, Morales confirmed the arrests.

The special section dedicated to the events in north St. Louis County on the organization's website carries the sub-headline: "People are standing up in Ferguson! It's Right to Rebel!"

"It may be about communism," Ferguson Township Democratic Committeewoman Patricia Bynes said of a group she has encountered tangentially in her nightly effort to quell the Ferguson unrest. "But that doesn't mean it should be about anarchy."

St. Louis Alderman Antonio French has been another constant presence in Ferguson since Brown's death.