FISA: The Law Behind Government Surveillance
The Foreign Intelligence Surveillance Act (FISA) of 1978 created a secret federal court — the FISA Court — to authorize surveillance of foreign powers and their agents on U.S. soil. Section 702, added in 2008, expanded NSA authority to collect communications of non-U.S. persons abroad in bulk. That collection inevitably sweeps in Americans' communications — without individual warrants — making it the most controversial surveillance authority in the U.S. legal arsenal.
Primary Text
50 U.S.C. § 1801“Notwithstanding any other law, the Attorney General may authorize the electronic surveillance of a foreign power or an agent of a foreign power... if the Attorney General finds that there is no substantial likelihood that the surveillance will acquire the contents of any communication to which a United States person is a party. (50 U.S.C. §1802)”
What It Means
FISA was enacted in 1978 in the wake of revelations that the NSA, FBI, and CIA had been conducting warrantless surveillance against U.S. citizens for decades — including civil rights leaders, journalists, and political opponents. The Church Committee investigations (1975–76) documented these abuses and Congress responded by creating the Foreign Intelligence Surveillance Court (FISC), a secret federal court that reviews government applications for foreign intelligence surveillance. The FISA Court operates entirely in secret, with no adversarial proceedings — the government presents its application and the court approves or rejects it without any opposing counsel.
Section 702, added by the FISA Amendments Act of 2008, dramatically expanded the law's scope. It permits the NSA to collect — without individual warrants — the communications of non-U.S. persons reasonably believed to be outside the United States for foreign intelligence purposes. The problem: those communications routinely include exchanges with U.S. persons. This 'incidental collection' of Americans' communications can then be searched by the FBI in criminal investigations — a practice critics call a 'backdoor search' that circumvents the Fourth Amendment's warrant requirement. In 2023, the FBI conducted more than 200,000 queries of Section 702 data using U.S. person identifiers.
Section 702 must be periodically reauthorized by Congress, making reauthorization debates the primary legislative opportunity to impose constraints. The 2023–2024 reauthorization battle exposed deep bipartisan divisions: surveillance hawks argued the program is essential to counterterrorism; civil libertarians argued that warrantless access to Americans' communications is a Fourth Amendment violation that no national security justification can cure. Congress ultimately reauthorized Section 702 in April 2024 with modest reforms, leaving the core architecture intact.
Real-World Application
Edward Snowden Revelations (2013): NSA contractor Edward Snowden disclosed the existence of PRISM — a Section 702-based program collecting internet communications from major tech companies including Google, Facebook, and Apple — and UPSTREAM collection, which harvested data directly from internet backbone infrastructure. The disclosures triggered global outrage, led to the USA FREEDOM Act (2015), and opened the Section 702 reauthorization debates that continue today. Tech companies now challenge FISA orders regularly, and the European Court of Justice has twice invalidated EU-US data transfer agreements citing FISA's incompatibility with fundamental rights.
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