secret wiretapping of USA citizens

read the below excerpt of a shocking story of secret wiretapping of our citizens by our government:

Thomas M. Tamm was entrusted with some of the government's most important secrets. He had a Sensitive Compartmented Information security clearance, a level above Top Secret. Government agents had probed Tamm's background, his friends and associates, and determined him trustworthy


In the spring of 2004, Tamm had just finished a yearlong stint at a Justice Department unit handling wiretaps of suspected terrorists and spies—a unit so sensitive that employees are required to put their hands through a biometric scanner to check their fingerprints upon entering.

While there, Tamm stumbled upon the existence of a highly classified National Security Agency program that seemed to be eavesdropping on U.S. citizens. The unit had special rules that appeared to be hiding the NSA activities from a panel of federal judges who are required to approve such surveillance.

When Tamm started asking questions, his supervisors told him to drop the subject. He says one volunteered that "the program" (as it was commonly called within the office) was "probably illegal."