Federal authorities dismantled an open-air drug market that operated day and night for years in and around Manhattan’s Washington Square Park, arresting a network of dogged narcotics dealers at the root of a rash of fatal overdoses, officials said.

Even repeated arrests were not enough to stop the crew from dealing its deadly poison, prosecutors said.

Over the past five years, cops have arrested participants more than 80 times for various drug-related offenses, only to see them back in action pushing fentanyl and heroin and dealing crack cocaine in the shadow of the park’s iconic arch.

“Through their coordinated and extensive drug trafficking, the defendants have maintained an open-air drug market in the Washington Square Park area, where drug addicts and users can secure narcotics a

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