The final arrest was made Monday, one week after agents learned of the alleged threats from an article in The Examiner in which activists Nathan Flynn and Sebastian Sassi, who are part of the Washington Village/Pigtown Neighborhood Planning Council, described encounters with Frost, Wyatt and Davis.

“Based on the information they provided the paper, and learning of the .38-caliber handgun, we looked at it with urgency and took action immediately,” Eckstein said.

Eckstein said he went that day to get arrest warrants from a city judge — who ordered the men held without bail. Frost was arrested Tuesday, Davis was locked up Friday and Wyatt was tracked down Monday, said Rick Binetti, spokesman for the state corrections system.

“I’m obviously pretty happy to hear it,” said Sassi, the director the community association’s public safety subcommittee. “We’re making the system do what it is supposed to be doing. It’s frustrating people like me have to get involved. But it shows you do need community involvement to move these things in the right direction. You need somebody like me on the outside agitating.”

Sassi and Flynn are part of a group of residents who pick up trash, fix up the neighborhood and work with police to improve the community.

But that activism has met backlash from area drug dealers, who don’t like the men disrupting their trade, they said.

Flynn said a known area drug dealer, who had pulled a gun on him before, threatened to shoot him and kill his dog two weeks ago.

Flynn said police told him that because they did not witness the incident, he had to go to the court commissioner’s office and swear out charges against the dealer.

But Flynn and Sassi said the court commissioner turned Flynn away.

“The woman there told me it’s not against the law to threaten a citizen,” Flynn said. “She said it would be a crime to threaten [Baltimore Mayor] Sheila Dixon, but not an average law-abiding citizen. … I was offended.”

Sassi said he saw Wyatt, who is facing drug dealing charges, on a street corner about a half-hour before his arrest Monday.

“He was hard at work,” Sassi said. “He was out there doing his ‘job.’ ”

Vernon Skuhr, chief of the state’s Community Surveillance Enforcement Program, said the warrants were obtained and served quickly because they were considered part of the state’s Violence Prevention Initiative designed to target the city’s most dangerous offenders.

“None of this would have happened several years ago because we didn’t have that kind of partnership with the Baltimore Police Department,” he said. “For Violence Prevention Unit cases, warrants are being issued quickly and served quickly. We think that’s playing a major role in the homicide reductions for the year in Baltimore.”