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This is what I wonder as well? I'm not a lawyer, but to expect someone to not disclose a known crime essentially makes that person part of a conspiracy to the crime, or an accessory to the crime, doesn't it?
Isn't it expected that a citizen would report crimes that he's aware of?
A person cannot knowingly aid and abet a fugitive (a criminal). The courts expect the person to report the fugitive to the police.
So if someone is violating a law, and using 'national security' as their cover, then you'd think the rules of law would still apply. Otherwise, that person who covers up for the criminals by not exposing it would be liable, or an accessory himself. Right?