Try Halliburton a corporation who aided the enemy (Iran) as early as 1995 . Iran was designated a state sponsor of terrorism on 1984.
U.S. Constitution
"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"
Halliburton confessed in open court live on C-SPAN. That it had contracts and operated in Iran.
goo.gl/gcQi4/
Using Executive Order 13382, 13094.
Along with recent NDAA of 2012 H. R. 1540. IMPOSITION OF SANCTIONS WITH RESPECT TO THE FINANCIAL SECTOR OF IRAN.
USA is able to go after both domestic and foreign people entities as indicated.