Edward Snowden leaked documents revealing the NSA was conducting mass surveillance programs like PRISM to collect data on American and foreign citizens. This raised debates on privacy violations versus national security. The document argues mass surveillance is justified for precautionary reasons in dealing with cyber threats from non-state actors and hostile states that exploit ambiguity. It also claims targeted surveillance would be ineffective given how cyber attacks can emerge from anywhere without links to sponsors. While revealing secret programs, mass surveillance has been publicly known and legally permitted for decades through laws like the Patriot Act.