Fourth Amendment: The Fourth Amendment protects against unreasonable searches and seizures by requiring law enforcement to obtain a warrant based on probable cause before conducting surveillance or searching someone's property.
USA PATRIOT Act: The USA PATRIOT Act is a law passed after 9/11 that expanded the government's authority to conduct surveillance in order to prevent terrorism.
Edward Snowden: Edward Snowden was a former NSA contractor who leaked classified documents revealing extensive government surveillance programs, sparking a global debate on privacy rights and government intrusion.