Quote Originally Posted by Domestic Security Enhancement Act of 2003, aka PATRIOT II
Section 201: Prohibition of Disclosure of Terrorism Investigation Detainee Investigation

In certain instances, the release of information about persons detained in connection with terrorism investigations could have a substantial adverse impact on the United States security interests, as well as the detainee's privacy. Cf. North Jersey Media Group, Inc. v. Ashcroft, 308 F.3d 198, 217-19 (3d Cir. 2002). Publicizing the fact that a particular alien has been detained could alert his coconspirators about the extent of the federal investigation and the imminence of their own detention, thus provoking them to flee to avoid detention and prosecution or to accelerate their terrorist plans before they can be disrupted.

Although the existing Freedom of Information Act (FOIA) exemptions 7(A), 7(C), and 7(F) (5 U.S.C. § 552(b)(7)) permit the government to protect information relating to detainees, defending this interpretation through litigation requires extensive Department of Justice resources, which would be better spend detecting and incapacitate terrorists. This provision thus establishes a specific authority under Exemption 3 of the FOIA to clarify what is already implicit in various FOIA exemptions: the government need not disclose information about individuals detained in investigations of terrorism until disclosure occurs routinely upon the initiation of criminal charges.
Thankfully, this bill never passed and probably never will, since it was drafted early last year and still hasn't passed.

However, if it were passed, the combination of powers granted by that bill along with the original patriot act is more than enough room for abuse. All they would need to do to secretly lock you away for life is to say that they're investigating you as a terrorist. That bill has a provision that allows them to revoke your US citizenship if you are being investigated for terrorism, the passage I just quoted would allow them to secretly arrest you, and then with the patriot act currently in force, they can hold you indefinitely without pressing charges.