Late at night, when helicopters thrum overhead and spotlights beam down onto lawns, many people here know exactly what's going on.
"You just think, 'Oh, God, whose child is it now?'" said Stephanie Spezia, a longtime resident of this suburb in the heart of Long Island that's caught in the grip of a violent street gang with Central American ties, MS-13.
MS-13 has been blamed for a trail of 11 corpses of mostly young people discovered in woods and vacant lots in Brentwood and neighboring Central Islip since the start of the school year.
The bloodshed in the blue-collar towns has gotten the attention of President Donald Trump, who says it's the result of lax immigration policies that let too many criminal "scum" slip through.
Attorney General Jeff Sessions on Friday gave a speech about the violence to law enforcement officials near a park where the bodies of four young men were found this month bearing MS-13's hallmarks: repeated slashes from a blade that left them nearly unrecognizable.
Some parents say they're afraid to let their children go to school. Teens say any perceived slight to a gang member, especially a refusal to join, can mean death.
After one high school warned parents not to let their kids wear anything gang-affiliated, gang members started deciding on a daily basis what colors were off-limits, leaving students to guess what not to wear.
"Kids are losing their childhoods," said Jennifer Suarez, whose 15-year-old niece was beaten and hacked to death last year. "You can see the stress on their faces as they get ready. It's like, you know, they're suiting up for battle."
So how does a street gang with ties to Central America gain such an aggressive foothold in the suburbs of Long Island?
MS-13, or the Mara Salvatrucha, is believed by federal prosecutors to have thousands of members across the U.S., primarily immigrants from Central America. It has a stronghold in Los Angeles, where it emerged in the 1980s as a neighborhood street gang.
But its true rise began after members were deported back to El Salvador in the 1990s. There, the gang thrived and spread to Honduras. MS-13 and rival groups there now control entire towns, rape girls and young women, massacre students, bus drivers and merchants who refuse to pay extortion and kill competitors.
That violence has prompted a migration of people trying to escape, especially children, who have streamed north because of a U.S. policy allowing people under 18 who arrive without parents to stay in the country temporarily with relatives or friends.
Since the fall of 2013, the U.S. has placed 165,000 unaccompanied minors. Long Island has been a frequent landing spot. Suffolk County, which includes Brentwood and Central Islip, has gotten 4,500. Neighboring Nassau County has received 3,800.
Sessions, speaking at a courthouse in Central Islip, said he believes gang members used this system to come north, too.
"Bad guys know how the system works, and they have exploited it," he said.
He later met with parents of some of the teenagers killed.
In a recent roundup of 13 MS-13 gang suspects accused of murder and other crimes, seven had entered as unaccompanied minors.
MS-13 is recruiting the unaccompanied children, Suffolk County police Commissioner Timothy Sini said. The youngsters, he said, "don't have an established social network, at least many of them don't, and MS-13 is providing that network."
All told, nearly 200 MS-13 gang suspects have been rounded up since September. Among the tactics Sini has employed have been stepped-up patrols, renewed cooperation with an FBI task force and helicopter sweeps of wooded areas where gang members gather.
Trump, a Republican, has promised to eradicate the gang in the U.S. through strict enforcement of immigration law.
"We are putting MS-13 in jail and getting them the hell out of our country," he told The Associated Press. "They are a bad group, and somebody said they are as bad as al-Qaida, which is a hell of a reference. ... We are out in Long Island cleaning out the MS-13 scum."
He spoke again about the gang on Friday in an address to the National Rifle Association.
The tough talk has made some residents fearful of law enforcement and the gang. They say it's not about immigration politics but about making a community safer.
Residents of Brentwood and Central Islip, with a combined population of about 100,000, say the area of modest ranch homes, warehouses and strip malls has always been a diverse, welcoming place for immigrants trying to make better lives for their children.
Some longtime residents say law enforcement bears some of the responsibility for the gang's rise because it ignored the burgeoning problem for years.
Parents say 4,200-student Brentwood High School lacks the means to help children who are often left alone after school because their parents work long hours. There are few social workers and guidance counselors, they say, and not enough security guards or cameras.
"They can't walk the halls without fear," said Evelyn Rodriguez, the mother of 16-year-old Kayla Cuevas, who was found beaten to death last fall.
In the months leading up to Kayla's death, she was involved in disputes with members and associates of MS-13, prosecutors said. Rodriguez said her daughter stood her ground and ended up dead.
Kayla and her 15-year-old friend Nisa Mickens were walking on a street near their homes when men with baseball bats and a machete attacked them.
Nisa was found dead on a residential tree-lined street a day before her 16th birthday. Kayla, who lived a block away, was discovered in a wooded backyard nearby.
"People, they missed the opportunity to know a really great person," said Nisa's father, Rob Mickens, who's running for the school board to help push for change. "They would have loved to know her."
Bertha Ullaguari said she noticed her 18-year-old son, Jorge Tigre, going from a good student on track to graduate from Bellport High to someone too afraid to go to school.
Then she got two truancy letters. When she pressed her son, he refused to tell her what was going on.
"Some bad things happened there," Ullaguari said, her voice trembling.
She had heard he had his tires slashed. There were rumors of gangs.
And then, about two weeks ago while she was driving with her daughter, they got a mysterious call. A girl on the line said Jorge was dead along with three others in a park.
"We nearly killed ourselves from the shock," said Ullaguari, an Ecuadorean immigrant.
The bodies of Jorge and the three others were found cut, their torsos exposed and hands bound, steps from a playground.
"It could happen to anybody's child, anywhere," Evelyn Rodriguez said. "We all need to be aware of this, and we need stand together. Because I don't want it to be your child."