WASHINGTON — In a private call with federal prosecutors across the country, Attorney General William Barr’s message was clear: Aggressively go after demonstrators who cause violence.

Barr pushed his U.S. attorneys to bring federal charges whenever they could, keeping a grip on cases even if a defendant could be tried instead in state court, according to officials with knowledge of last week's call who spoke to The Associated Press on condition of anonymity. Federal convictions often result in longer prison sentences.

The Trump administration’s crackdown has already led to more than 300 arrests on federal crimes in the protests that erupted following the death of George Floyd. An AP analysis of the data shows that while many are accused of violent crimes like arson for hurling Molotov cocktails and burning police cars and assault for injuring law enforcement, others are not — prompting criticism that at least some arrests are a politically motivated effort to stymie demonstrations.

“The speed at which this whole thing was moved from state court to federal court is stunning and unbelievable,” said Charles Sunwabe, who’s representing an Erie, Pennsylvania, man accused of lighting a fire at a coffee shop after a May 30 protest. “It’s an attempt to intimidate these demonstrators and to silence them,” he said.

Some cases are viewed as trumped up and should not be in federal court, lawyers say, like a teen accused of civil disorder for claiming online “we are not each other’s enemy, only enemy is 12,” a reference to law enforcement.

The Trump administration has seized on the demonstrations and an aggressive federal response to showcase what the president says is his law-and-order prowess, claiming he’s countering rising crime in cities run by Democrats. Trump has derided protesters and played up the violence around protests, though the majority are peaceful.

Pockets of violence have indeed popped up in cities across the U.S., including Portland, Oregon, where protests devolved into clashes with law enforcement for weeks on end. Nights of looting and other unrest have occurred in other cities, including Rochester, New York; Minneapolis, Louisville, Washington and Chicago.

Federal officials were also called into to Kenosha, Wisconsin, after large protests and unrest following the shooting of Jacob Blake and the gunning down of two protesters and later arrest of a 17-year-old in their deaths. Notably, that teen has not been charged with any federal crimes. Neither was a man accused of shooting and killing a demonstrator in Louisville following the death of Breonna Taylor.

While Barr has gone after protest-related violence targeted at law enforcement, he has argued there’s seldom reason to open sweeping investigations into the practices of police departments. The Justice Department, however, has opened a number of civil rights investigations into individual cases. Barr has said he does not believe there is systemic racism in police departments.

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Federal involvement in local cases is nothing new. Officials across the country have turned to the Justice Department for decades, particularly for violent crime and gang cases where offenders could face much stiffer federal penalties and there is no parole.

Police chiefs in several cities have pointed to the importance of their relationships with federal prosecutors to bring charges that can result in long prison sentences to drive down violent crime.

Even before the unrest earlier this year, the Justice Department was stepping in to bring charges in states where the government believes justice isn’t being fully pursued by local prosecutors. In January, for example, the department brought federal hate crime charges against a woman accused of slapping three Orthodox Jewish women in one of several apparently anti-Semitic attacks reported throughout New York during Hanukkah.

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It’s not clear whether protest-related arrests will continue apace. Demonstrations have slowed, though not necessarily because of the federal charges. Wildfires in the West and hurricanes in the South have dampened some of the conflict.

While many local prosecutors have dismissed dozens of low-level protest arrests, some are still coming down hard. A Pennsylvania judge set bail at $1 million for about a dozen people in a protest that followed the death of a knife-wielding man by police.

Even some Democrats, including District of Columbia Mayor Muriel Bowser, have called for the Justice Department to pursue federal charges against violent demonstrators, going as far as accusing the Trump administration of declining to prosecute rioters. Washington's Metropolitan Police Department had arrested 42 people one August weekend after a protest left a trail of vandalism. But prosecutors said the arrest paperwork didn’t identify specific crimes tied to each suspect.

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The federal confrontation with Bowser seemed counterintuitive, though Trump has a history of squaring off against the Democratic mayor.

About a third of the federal protest-related cases are in Portland, for crimes such as assaulting a deputy U.S. marshal with a baseball bat, setting fires and setting off explosives at the federal courthouse and throwing rocks at officers.

Three purported “Boogaloo” members, who use the loose movement’s name as a slang term for a second civil war or collapse of civilization, were charged with possessing a homemade bomb and inciting a riot in Las Vegas.

An El Paso, Texas, man was accused of promoting hate speech, posting a video online with a racist epithet and making threatening comments to Black Lives Matter protesters while holding a military-style rifle at his feet. A Minnesota man was accused of helping burn down a police precinct headquarters there after Floyd's death.

But other cases simply don't belong in federal court, lawyers say.

In Seattle, 35-year-old Isaiah Willoughby, who’s accused of setting fire to the outside of a police precinct, faces a mandatory minimum of five years in prison if convicted of arson in federal court. He could be looking at around a year behind bars in state court, where his lawyer said the case belongs.

“This is city property that has been destroyed and you have a local prosecutors office that is ready and willing and able to charge these cases in state court, but the federal government is attempting to emphasize these protest-related crimes for whatever agenda they are seeking to pursue,” said assistant federal public defender Dennis Carroll.

Carroll accused federal authorities of using the cases to try to make the protests seem more violent and disruptive than they really were.

Federal prosecutors earlier this month agreed to dismiss the charge against a man who authorities said was found with a Molotov cocktail in his backpack after he and other protesters were arrested in May for blocking traffic in Jacksonville, Florida. Video showed that 27-year-old Ivan Zecher was wrongfully arrested because he was actually on the sidewalk — not in the street — meaning prosecutors couldn’t pursue their case, Zecher’s attorney, Marcus Barnett said.

“There is absolutely an agenda here to blow these out of proportion, make these look more serious or more sinister than it is,” Barnett said of the pursuit of federal charges. “This is the Justice Department, from the top, furthering an agenda that has nothing to do with justice,” he said.