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The persecutor plans to impose fear and self-censorship on visitors from many countries (the ones whose citizens don't need visas to visit the US) by demanding almost full cooperation with monitoring of their past and future communications. The one thing not demanded is your GPG keys. There will surely be no stated criterion for what things it is forbidden to say, so no one could be sure

the Guardian
‘Censorship pure and simple’: critics hit out at Trump plan to vet visitors’ social media
Some warn proposal will decimate US tourism industry as free speech advocates say it will lead to people self-censoring








