sentences:  The revocation of his passport did not impermissibly burdens his freedom to travel because the freedom to travel abroad with a "letter of introduction" in the form of a passport issued by the sovereign is subordinate to national security and foreign policy considerations; as such, it is subject to reasonable governmental regulation.The action was not intended to penalize his exercise of free speech and deter his criticism of Government policies and practices because assuming, arguendo, that First Amendment protections reach beyond our national boundaries, revocation of Agee's passport rested in part on the content of his speech.To the extent the revocation of his passport operates to inhibit Agee, "it is an inhibition of action," rather than of speech.