By Laura K. Donohue

The National Security Agency’s recently revealed surveillance programs undermine the purpose of the Foreign Intelligence Surveillance Act, which was established to prevent this kind of overreach. They violate the Fourth Amendment’s guarantee against unreasonable search and seizure. And they underscore the dangers of growing executive power.

The intelligence community has a history of overreaching in the name of national security. In the mid-1970s, it came to light that, since the 1940s, the NSA had been collecting international telegraphic traffic from companies, in the process obtaining millions of Americans’ telegrams that were unrelated to foreign targets. From 1940 to 1973, the CIA and the FBI engaged in covert mail-opening programs that violated laws prohibiting the interception or opening of mail. The agencies also conducted warrantless “surreptitious entries,” breaking into targets’ offices and homes to photocopy or steal business records and personal documents. The Army Security Agency intercepted domestic radio communications. And the Army’s CONUS program placed more than 100,000 people under surveillance, including lawmakers and civil rights leaders.

After an extensive investigation of the agencies’ actions, Congress passed the 1978 Foreign Intelligence Surveillance Act (FISA) to limit sweeping collection of intelligence and create rigorous oversight. But 35 years later, the NSA is using this law and its subsequent amendments as legal grounds to run even more invasive programs than those that gave rise to the statute.

Read More NSA surveillance may be legal — but it’s unconstitutional – The Washington Post.