The American Civil Liberties Union of New York has asked a federal judge to unseal documents that would show how the federal government got one of the warrants that resulted in the largest immigration raid this year in Upstate New York.

Magistrate Judge Therese Wiley Dancks granted two warrants in August and has closed the case to the public. Documents under seal would reveal the argument Homeland Security agents made to win the judge’s blessing to enter a Cato nutrition bar factory in early September.

Federal agents, with support from sheriff’s deputies in Cayuga and Oswego counties, swarmed the plant, broke down doors and herded workers into a break room.

Witnesses described it as a “massive military-style assault” by about 75 law enforcement agents bearing machine guns and coming w

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