Israel has had a rare showing of common sense and barred hack Communist Noam Chomsky from entry. No State should ever require entry of a person who supports terrorism against that State from entry. In fact if this were an American supporting armed contras against the narco terrorist
state of Venezuela or the Castro regime the person would be jailed.
In reality freedom of speech should only be limited to citizens. If you are here on a student visa and are arrested at violent demonstration the student visa should be terminated.