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National Security Agency United States SIGINT signals intelligence eavesdropping surveillance privacy Fourth Amendment Edward Snowden whistleblower controversy ethics morality technology security intelligence gathering information analysis SIGINT espionage surveillance monitoring intercept collect process store retrieve disseminate intelligence signals communications data information privacy Fourth Amendment Edward Snowden whistleblower controversy ethics morality
A غرفة de controle da Agência de Segurança Nacional dos Estados Unidos
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