>Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
When it comes to indicting and prosecuting those involved, the government has to get past the 1st Amendment hurdle – it's a high bar to clear, but the point is that in this case, it may actually be possible.