Global surveillance disclosures (1970–2013)

Global surveillance refers to the practice of globalized mass surveillance on entire populations across national borders. Although its existence was first revealed in the 1970s and led legislators to attempt to curb domestic spying by the National Security Agency (NSA), it did not receive sustained public attention until the existence of ECHELON was revealed in the 1980s and confirmed in the 1990s.

Source: Wikipedia — Global surveillance disclosures (1970–2013) (CC BY-SA 4.0)