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https://www.law.cornell.edu/uscode/text/8/1182
B) Terrorist activities
(i) In generalAny alien who—
(I) has engaged in a terrorist activity;
(II) a consular officer, the Attorney General, or the Secretary of Homeland Security knows, or has reasonable ground to believe, is engaged in or is likely to engage after entry in any terrorist activity (as defined in clause (iv));
(III) has, under circumstances indicating an intention to cause death or serious bodily harm, incited terrorist activity;
(IV) is a representative (as defined in clause (v)) of—
(aa) a terrorist organization (as defined in clause (vi)); or
(bb) a political, social, or other group that endorses or espouses terrorist activity;
(V) is a member of a terrorist organization described in subclause (I) or (II) of clause (vi);
(VI) is a member of a terrorist organization described in clause (vi)(III), unless the alien can demonstrate by clear and convincing evidence that the alien did not know, and should not reasonably have known, that the organization was a terrorist organization;
(VII) endorses or espouses terrorist activity or persuades others to endorse or espouse terrorist activity or support a terrorist organization;
(VIII) has received military-type training (as defined in section 2339D(c)(1) of title 18) from or on behalf of any organization that, at the time the training was received, was a terrorist organization (as defined in clause (vi)); or
(IX) is the spouse or child of an alien who is inadmissible under this subparagraph, if the activity causing the alien to be found inadmissible occurred within the last 5 years,
is inadmissible. An alien who is an officer, official, representative, or spokesman of the Palestine Liberation Organization is considered, for purposes of this chapter, to be engaged in a terrorist activity.
(ii) ExceptionSubclause (IX) of clause (i) does not apply to a spouse or child—
(I) who did not know or should not reasonably have known of the activity causing the alien to be found inadmissible under this section; or
(II) whom the consular officer or Attorney General has reasonable grounds to believe has renounced the activity causing the alien to be found inadmissible under this section.
(iii) “Terrorist activity” definedAs used in this chapter, the term “terrorist activity” means any activity which is unlawful under the laws of the place where it is committed (or which, if it had been committed in the United States, would be unlawful under the laws of the United States or any State) and which involves any of the following:
(I) The highjacking or sabotage of any conveyance (including an aircraft, vessel, or vehicle).
(II) The seizing or detaining, and threatening to kill, injure, or continue to detain, another individual in order to compel a third person (including a governmental organization) to do or abstain from doing any act as an explicit or implicit condition for the release of the individual seized or detained.
(III) A violent attack upon an internationally protected person (as defined in section 1116(b)(4) of title 18) or upon the liberty of such a person.
(IV) An assassination.
(V) The use of any—
(a) biological agent, chemical agent, or nuclear weapon or device, or
(b) explosive, firearm, or other weapon or dangerous device (other than for mere personal monetary gain),
with intent to endanger, directly or indirectly, the safety of one or more individuals or to cause substantial damage to property.
(VI) A threat, attempt, or conspiracy to do any of the foregoing.
(iv) “Engage in terrorist activity” definedAs used in this chapter, the term “engage in terrorist activity” means, in an individual capacity or as a member of an organization—
(I) to commit or to incite to commit, under circumstances indicating an intention to cause death or serious bodily injury, a terrorist activity;
(II) to prepare or plan a terrorist activity;
(III) to gather information on potential targets for terrorist activity;
(IV) to solicit funds or other things of value for—
(aa) a terrorist activity;
(bb) a terrorist organization described in clause (vi)(I) or (vi)(II); or
(cc) a terrorist organization described in clause (vi)(III), unless the solicitor can demonstrate by clear and convincing evidence that he did not know, and should not reasonably have known, that the organization was a terrorist organization;
(V) to solicit any individual—
(aa) to engage in conduct otherwise described in this subsection;
(bb) for membership in a terrorist organization described in clause (vi)(I) or (vi)(II); or
(cc) for membership in a terrorist organization described in clause (vi)(III) unless the solicitor can demonstrate by clear and convincing evidence that he did not know, and should not reasonably have known, that the organization was a terrorist organization; or
(VI) to commit an act that the actor knows, or reasonably should know, affords material support, including a safe house, transportation, communications, funds, transfer of funds or other material financial benefit, false documentation or identification, weapons (including chemical, biological, or radiological weapons), explosives, or training—
(aa) for the commission of a terrorist activity;
(bb) to any individual who the actor knows, or reasonably should know, has committed or plans to commit a terrorist activity;
(cc) to a terrorist organization described in subclause (I) or (II) of clause (vi) or to any member of such an organization; or
(dd) to a terrorist organization described in clause (vi)(III), or to any member of such an organization, unless the actor can demonstrate by clear and convincing evidence that the actor did not know, and should not reasonably have known, that the organization was a terrorist organization.
B) Terrorist activities
(i) In generalAny alien who—
(I) has engaged in a terrorist activity;
(II) a consular officer, the Attorney General, or the Secretary of Homeland Security knows, or has reasonable ground to believe, is engaged in or is likely to engage after entry in any terrorist activity (as defined in clause (iv));
(III) has, under circumstances indicating an intention to cause death or serious bodily harm, incited terrorist activity;
(IV) is a representative (as defined in clause (v)) of—
(aa) a terrorist organization (as defined in clause (vi)); or
(bb) a political, social, or other group that endorses or espouses terrorist activity;
(V) is a member of a terrorist organization described in subclause (I) or (II) of clause (vi);
(VI) is a member of a terrorist organization described in clause (vi)(III), unless the alien can demonstrate by clear and convincing evidence that the alien did not know, and should not reasonably have known, that the organization was a terrorist organization;
(VII) endorses or espouses terrorist activity or persuades others to endorse or espouse terrorist activity or support a terrorist organization;
(VIII) has received military-type training (as defined in section 2339D(c)(1) of title 18) from or on behalf of any organization that, at the time the training was received, was a terrorist organization (as defined in clause (vi)); or
(IX) is the spouse or child of an alien who is inadmissible under this subparagraph, if the activity causing the alien to be found inadmissible occurred within the last 5 years,
is inadmissible. An alien who is an officer, official, representative, or spokesman of the Palestine Liberation Organization is considered, for purposes of this chapter, to be engaged in a terrorist activity.
(ii) ExceptionSubclause (IX) of clause (i) does not apply to a spouse or child—
(I) who did not know or should not reasonably have known of the activity causing the alien to be found inadmissible under this section; or
(II) whom the consular officer or Attorney General has reasonable grounds to believe has renounced the activity causing the alien to be found inadmissible under this section.
(iii) “Terrorist activity” definedAs used in this chapter, the term “terrorist activity” means any activity which is unlawful under the laws of the place where it is committed (or which, if it had been committed in the United States, would be unlawful under the laws of the United States or any State) and which involves any of the following:
(I) The highjacking or sabotage of any conveyance (including an aircraft, vessel, or vehicle).
(II) The seizing or detaining, and threatening to kill, injure, or continue to detain, another individual in order to compel a third person (including a governmental organization) to do or abstain from doing any act as an explicit or implicit condition for the release of the individual seized or detained.
(III) A violent attack upon an internationally protected person (as defined in section 1116(b)(4) of title 18) or upon the liberty of such a person.
(IV) An assassination.
(V) The use of any—
(a) biological agent, chemical agent, or nuclear weapon or device, or
(b) explosive, firearm, or other weapon or dangerous device (other than for mere personal monetary gain),
with intent to endanger, directly or indirectly, the safety of one or more individuals or to cause substantial damage to property.
(VI) A threat, attempt, or conspiracy to do any of the foregoing.
(iv) “Engage in terrorist activity” definedAs used in this chapter, the term “engage in terrorist activity” means, in an individual capacity or as a member of an organization—
(I) to commit or to incite to commit, under circumstances indicating an intention to cause death or serious bodily injury, a terrorist activity;
(II) to prepare or plan a terrorist activity;
(III) to gather information on potential targets for terrorist activity;
(IV) to solicit funds or other things of value for—
(aa) a terrorist activity;
(bb) a terrorist organization described in clause (vi)(I) or (vi)(II); or
(cc) a terrorist organization described in clause (vi)(III), unless the solicitor can demonstrate by clear and convincing evidence that he did not know, and should not reasonably have known, that the organization was a terrorist organization;
(V) to solicit any individual—
(aa) to engage in conduct otherwise described in this subsection;
(bb) for membership in a terrorist organization described in clause (vi)(I) or (vi)(II); or
(cc) for membership in a terrorist organization described in clause (vi)(III) unless the solicitor can demonstrate by clear and convincing evidence that he did not know, and should not reasonably have known, that the organization was a terrorist organization; or
(VI) to commit an act that the actor knows, or reasonably should know, affords material support, including a safe house, transportation, communications, funds, transfer of funds or other material financial benefit, false documentation or identification, weapons (including chemical, biological, or radiological weapons), explosives, or training—
(aa) for the commission of a terrorist activity;
(bb) to any individual who the actor knows, or reasonably should know, has committed or plans to commit a terrorist activity;
(cc) to a terrorist organization described in subclause (I) or (II) of clause (vi) or to any member of such an organization; or
(dd) to a terrorist organization described in clause (vi)(III), or to any member of such an organization, unless the actor can demonstrate by clear and convincing evidence that the actor did not know, and should not reasonably have known, that the organization was a terrorist organization.