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Former FBI agents have written a letter to FBI Director James Comey offering support and a note of caution for the agency’s Hillary Clinton email investigation.

The letter from March 16, obtained by Fox News, was written by John F. Good, president of the Long Island Chapter of the Society of Former Special Agents of the FBI. The chapter includes a few former members who worked in the notorious 1978 ABSCAM investigation which targeted sitting members of Congress, Fox News reported.

The letter offered Comey and current agents support in the “enormous challenge” they face in the Clinton probe, adding that “not only does the future of the Bureau but also that of the United States of America rests on the outcome of this crucial case.”

“Decisions must be made on facts alone. Much is at stake here — people’s trust in the Bureau for years to come, as well as the Bureau’s reputation among our allies, partners, and friends as the greatest law enforcement agency in the world,” wrote Good, in the letter.

The 1978 sting operation known as ABSCAM involved over 30 political figures with six House members and one U.S. senator who were convicted of crimes. The corruption investigation was portrayed in the 2013 Golden Globe-winning movie “American Hustle.”

“Yours and the Bureau’s challenge today is a far cry from what existed thirty-eight years ago,” Good, 79, wrote in the letter.

Good noted that, though the agency had the full support of then-FBI Director William Webster during the ABSCAM probe, current agents appear not to have that from Attorney General Loretta Lynch and the Justice Department.

“It does not appear that the same relationship between the FBI and DOJ exists today on the case,” Good told Fox.

The Clinton investigation, he said, comes down to whether there is a different set of rules that apply to the powerful or if all are equal under the law in the U.S.

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