Everyone is free to critize the government, to accuse it of any atrocity and to denounce it on the basis of those accusations. What you cannot do is disclose i

Everyone is free to critize the government, to accuse it of any atrocity and to denounce it on the basis of those accusations. What you cannot do is disclose internal information to which you have privileged access as a government agent/employee/contractor. You have ample notice of this fact before agreeing to become one. In fact you must go out of your way to apply for a security clearance. If you find this an unacceptable infringement of your freedom, you may choose not to work for the government. Snowden is not subject to arrest for dissent, but for what is effictively a breach of his employment contract. SCOTUS recently held that government employees cannot even be fired for disparaging the government provided they do not identify themselves as government employees when doing so.