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The union representing New York state troopers is opposing the opening of now-sealed records about the investigation into the Attica Correctional Facility riot of 1971.

The troopers' Police Benevolent Association says it will file court papers Friday opposing Attorney General Eric Schneiderman's request to open the records.

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Much of the content from the records that could be unsealed consists of grand jury testimony about the riot and the prison retaking. Attica was the nation's deadliest prison riot; 43 people died there.

Union President Thomas Mungeer said in a statement Friday the union has a duty to protect the rights of troopers forced to testify about their actions during the riot.

"The PBA has stood by them and will continue to stand by them in order to preserve the sanctity of confidential testimony during the grand jury process for all citizens in the state of New York," Mungeer said.

Schneiderman says he wants to reveal the fuller history of the nation's bloodiest prison rebellion and answer the questions of families whose loved ones died.

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