; and (2) by adding at the end the following: (I) Failure to register as a sex offender Any alien convicted of, or who admits having committed, or who admits committing acts which constitute the essential elements of a violation of section 2250 of title 18, United States Code (relating to failure to register as a sex offender) is deportable. . (c) Effective date The amendments made by this section shall take effect on the date of the enactment of this Act and shall apply to acts that occur before, on, or after the date of the enactment of this Act. 3303. Grounds of inadmissibility and deportability for alien gang members (a) Definition of gang member Section 101(a) of the Immigration and Nationality Act ( 8 U.S.C. 1101(a) ) is amended by adding at the end the following: (53) The term criminal gang means an ongoing group, club, organization, or association of 5 or more persons that has as one of its primary purposes the commission of 1 or more of the following criminal offenses and the members of which engage, or have engaged within the past 5 years, in a continuing series of such offenses, or that has been designated as a criminal gang by the Secretary of Homeland Security, in consultation with the Attorney General, as meeting these criteria. The offenses described, whether in violation of Federal or State law or foreign law and regardless of whether the offenses occurred before, on, or after the date of the enactment of this paragraph, are the following: (A) A felony drug offense (as defined in section 102 of the Controlled Substances Act ( 21 U.S.C. 802 )). (B) A felony offense involving firearms or explosives or in violation of section 931 of title 18, United States Code (relating to purchase, ownership, or possession of body armor by violent felons). (C) An offense under section 274 (relating to bringing in and harboring certain aliens), section 277 (relating to aiding or assisting certain aliens to enter the United States), or section 278 (relating to importation of alien for immoral purpose). (D) A crime of