Get a job.
"We're hiring," Brown said at a news conference. "Get off that protest line and put an application in. We'll put you in your neighborhood and help you resolve some of those problems."
Now it seems some people may have been listening.
Employment applications to the Dallas Police Department have more than tripled since the shooting July 7 that killed five officers and injured nine more, according to statistics posted on the department's Facebook page. It is not known whether any of the applicants were protesters or connected to the Black Lives Matter movement.
From June 8 to June 20, the department received about 11 applications per day. From July 8 to July 20, it received nearly 40 per day.
In recent months, the department was forced to cancel training academy classes for a lack of recruits.
"I know what he's going through," former New York City police commissioner Bernard Kerik told The Washington Post just days after the Dallas shooting.
The Dallas shooting was the deadliest event for U.S. law enforcement since the Sept. 11, 2001, terrorist attacks, during which Kerik led the New York Police Department.
"That statement in itself I think is representative of the way cops feel," he said. "You want to do something for your community, get off the protest line, take the test, and you can work in your community."
Brown, though, faced criticism in June over a series of resignations from the department over what Dallas Police Association President Ron Pinkston called "low pay, bad management and a lack of boots on the ground."
About 240 officers left the Dallas Police Department during fiscal 2015, according to the Dallas Morning News.
The turnover rate in the department, which employs 3,500 officers, was 6.8 percent during fiscal 2015, the highest in Brown's six-year tenure and the highest since the 1980s.
The city budgeted to hire 200 new officers during fiscal 2016, though on average about 200 officers leave the department as well, according to the Dallas Morning News.
Pinkston before the July shooting said the department was "broken" and its leadership was not working to solve existing problems, the Dallas Morning News reported.
But after the shooting, Brown gained national acclaim for how forcefully he supported grieving officers and his compassionate yet stern approach to demonstrators.
"We're asking cops to do too much in this country," he said. "We are. Every societal failure, we put it off on the cops to solve. Not enough mental-health funding, let the cops handle it. … Here in Dallas, we got a loose-dog problem; let's have the cops chase loose dogs. Schools fail, let's give it to the cops. … That's too much to ask. Policing was never meant to solve all those problems."
He said that if he were confronted with the same problems many Americans find in modern policing, he would not demonstrate.
"I probably wouldn't protest or complain" he said. "I'd get involved and do something about it, by becoming part of the solution."
Twitter users afterward tried to draft Brown for president, one job he did not say anything about.
Correction: A previous version of this post misstated how much the police department's application pool increased. It has been corrected.