NEW YORK (AP) — A New York City jail guard has been sentenced to six years in prison for ordering inmate beatings as part of a rogue disciplinary system.

Lloyd Nicholson was convicted in June of gang assault charges.

Prosecutors said he imposed order in a unit at the city’s Rikers Island jail complex by having teenage inmates beat other teenagers who had stepped out of line.

One attack left a young prisoner with a punctured lung.

Nicholson said he was innocent, and was backed by the union that represents jail guards.

They said the allegations were fabricated by the prisoners.

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