Three suspected Southie drug dealers are behind bars on serious charges after cops swept the neighborhood, busting one man on fentanyl charges and two more on suspicion of slinging meth out of a pair of South Boston homes — including swanky digs on booming West Broadway.

David Maxwell, 53, of 5 Mohawk St., and Edward Hamill, 37, of 50 W. Broadway, were both scooped up in what the cops referred to as “Operation Tomahawk” on Thursday and pleaded not guilty Friday morning in South Boston District Court to selling methamphetamine.

Maxwell remains held on $500,000 cash bail, and Hamill on $200,000. The cops say they found Maxwell with 450 grams of meth, and Hamill with 85 grams of the drug that authorities say is increasingly a problem in the Boston area.

The local and federal authorities had zeroed in on Maxwell’s apartment as a hub of what a police report says was a meth “distribution operation” between two Southie addresses. Officers staked out the Mohawk Street address following complaints from neighbors, and served a warrant Thursday morning, according to police reports. They arrested Maxwell and found the 450 grams of meth, a bottle of the drug GHB, and scales for measuring, police wrote.

BPD officers and federal DEA agents armed with a warrant on Thursday busted down the door to Hamill’s apartment at 50 W. Broadway, a pricey new apartment building. Hamill, who was inside, told the officers he too had meth and GHB — which is known as a “date-rape” drug — in his bedroom, according to the police report. The cops found the 85 grams of meth in several bags, plus several bottles of GHB, as well as scales, measuring equipment and packing materials, according to the police report.

The police also confiscated $1,800 in what they suspect is counterfeit money, plus $47,772 of apparent real cash, the report states.

The cops also charged Hamill’s roommate Kevin Riley with possessing meth — and took away Riley’s legally owned handgun, according to police reports.

Police in a different investigation on Thursday also arrested Edward Kneip, 47, of 501 E. Broadway, on a charge of dealing drugs. He was arraigned Thursday, when he pleaded not guilty and remains locked up on $5,000 cash bail.

Police wrote that Kneip is “responsible for distributing various narcotics including heroin, fentanyl, and crack cocaine” in Southie.

The cops nabbed him when he was walking his dog, and then search his apartment, finding 45 grams of the powerful and dangerous opioid fentanyl and more of “an unknown white substance,” according to a police report.

At-large City Councilor Michael Flaherty, who’s from South Boston, told the Herald, “The manufacturing and distribution of methamphetamine, the date-rape drug GHB and fentanyl in our city will not be tolerated. The Boston Police Drug Unit did a great job apprehending these creeps and took some of the most dangerous and deadly drugs off of our streets.”