It is a federal crime
"if two or more persons conspire...to defraud the United States, or any agency thereof on any manner or for any purpose."
2) to obstruct a lawful function of the government
3) by deceitful or dishonest means, and
4) committed at least one overt act in furtherance of the conspiracy.
The comey blackmail effort to get trump.
The effort to generate a phony ICA.
HRC - Perkins Cole - FusionGPS - Steele - Our
Whatever Brennan did off books.
Everything Weissman did.