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The Justice Department has said in court filings that among the 100-plus classified documents taken in August, some were marked “HCS,” a category of highly classified government information that refers to “HUMINT Control Systems,” which are systems used to protect intelligence gathered from secret human sources.

Among the 100-plus classified documents taken in August, some were marked “HCS,” a category of highly classified government information that refers to “HUMINT Control Systems,” which are systems used to protect intelligence gathered from secret human sources, according to a court filing.

The documents seized on Aug. 8, we would learn, included some with "sensitive compartmented information" designations that marked them as having come from HUMINT, or human intelligence, and SI, or signals intelligence, and potentially containing the most closely held kinds of government secrets — the identities of some of its agents and sources of intelligence information.

The “HCS” acronym stands for “HUMINT Control Systems” and refers to the government systems used to protect intelligence gathered from secret human sources, the affidavit says.

Once you get into HUMINT, SI, FISA, and OCORN, you get into really, really classified.