; and (B) in the absence of countervailing evidence, such act shall be sufficient in the proper proceeding to authorize the revocation and setting aside of the order admitting such person to citizenship and the cancellation of the certificate of naturalization as having been obtained by concealment of a material fact or by willful misrepresentation; and (C) such revocation and setting aside of the order admitting such person to citizenship and such canceling of certificate of naturalization shall be effective as of the original date of the order and certificate, respectively. (2) The acts described in this paragraph that shall subject a person to a revocation and setting aside of his or her naturalization under paragraph (1)(B) are— (A) any activity a purpose of which is the opposition to, or the control or overthrow of, the Government of the United States by force, violence, or other unlawful means; (B) engaging in a terrorist activity (as defined in clauses (iii) and (iv) of section 212(a)(3)(B)); (C) incitement of terrorist activity under circumstances indicating an intention to cause death or serious bodily harm; and (D) receiving military-type training (as defined in section 2339D(c)(1) of title 18, United States Code) from or on behalf of any organization that, at the time the training was received, was a terrorist organization (as defined in section 212(a)(3)(B)(vi)). . (b) Effective date The amendments made by subsection (a) shall take effect on the date of the enactment of this Act and shall apply to acts that occur on or after such date. 1627. Treatment of pending applications during denaturalization proceedings (a) In general Section 204(b) of the Immigration and Nationality Act ( 8 U.S.C. 1154(b) ) is amended— (1) by striking After and inserting (1) Except as provided in paragraph (2), after