That neonazi protest in Germany would be illegal. What crime has the candidate deportee committed here?
He's likely made himself deportable under our immigrations laws:
is deportable.
(B) Terrorist activities
Any alien who is described in subparagraph (B) or (F) of section 1182(a)(3) of this title is deportable.
(B) Terrorist activities
(i) In general
Any 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,
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Hamas has been officially designated as a foreign terrorist organization. From what I can gather, the group that this guy has acted as a spokesperson for, and for whom he has led rallies/protests for, has been handing out pamphlets with Hamas logos on them. If so, he's probably gone.
If the intimidation of the Jewish students can be proven, and if the damage to the campus can be proven/attributed, it can likely be interpreted as terrorist activities, and another reason to deport.
There seems to be great leeway for the Attorney General and/or Sec or Homeland Security to deport based on their beliefs per the above.