The material support clause appears to apply to designated "international terrorist organizations". That could theoretically apply to PETA or Earth First, if the US Secretary of State, were to so designate those groups.
NOTE: this is another section of the House bill, H.R.6054, found elsewhere, at:
http://72.14.205.104/search?q=cache:mSOW2VGP8x4J:thomas.loc.gov/cgi-bin/cpquery/%3F%26sid%3Dcp109p3bcL%26refer%3D%26r_n%3Dhr664p1.109%26db_id%3D109%26item%3D%26sel%3DTOC_188574%26+Military+Commissions+material+support&hl=en&gl=us&ct=clnk&cd=3&ie=UTF-8House Report 109-664 - Part 1 - AMENDING TITLE 10, UNITED STATES CODE, TO AUTHORIZE TRIAL BY MILITARY COMMISSION FOR VIOLATIONS OF THE LAW OF WAR, AND FOR OTHER PURPOSES
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Sec. 950v. Crimes triable by military commissions
(23) TERRORISM- An alien unlawful enemy combatant subject to this title who intentionally kills or inflicts great bodily harm on one or more persons, or intentionally engages in an act that evinces a wanton disregard for human life, in a manner calculated to influence or affect the conduct of government or civilian population by intimidation or coercion, or to retaliate against government conduct, shall be guilty of the offense of terrorism and shall be subject to whatever punishment a commission may direct, including, if death results to one or more of the victims, the penalty of death.
(24) PROVIDING MATERIAL SUPPORT FOR TERRORISM- An alien unlawful enemy combatant who provides material support or resources, knowing or intending that they are to be used in preparation for, or in carrying out, an act of terrorism (as defined in paragraph (23)), or who intentionally provides material support or resources to an international terrorist organization engaged in hostilities against the United States, knowing that such organization has engaged or engages in terrorism (as defined in paragraph (23)), shall be guilty of the offense of providing material support for terrorism and shall be subject to whatever punishment a commission may direct. In this paragraph, the term `material support or resources' has the meaning given that term in section 2339A(b) of title 18.
(25) WRONGFULLY AIDING THE ENEMY- An alien unlawful enemy combatant who, in breach of an allegiance or duty to the United States, knowingly and intentionally aids an enemy of the United States or one its co-belligerents shall be guilty of the offense of wrongfully aiding the enemy and shall be subject to whatever punishment a commission may direct.
(26) SPYING- An alien unlawful enemy combatant who, with intent or reason to believe that it is to be used to the injury of the United States or to the advantage of a foreign power, collects or attempts to collect certain information by clandestine means or while acting under false pretenses, for the purpose of conveying such information to an enemy of the United States or one of its co-belligerents, shall be guilty of the offense of spying and shall be subject to whatever punishment a commission may direct, including the penalty of death.
(27) CONSPIRACY- An alien unlawful enemy combatant who conspires to commit one or more substantive offenses triable under this section, and who knowingly does any overt act to effect the object of the conspiracy, shall be guilty of conspiracy and shall be subject to whatever punishment a commission may direct, including, if death results to one or more of the victims, the penalty of death.