It is a Constitutional right to petition for POSSIBLE secession. Which, if approved by the official governing body, will pass it down to each State for voting among the citizens of that State. It does NOT mean any individual who sighed such a petition necessarily wants to secede. But maybe it is the only thing they see that can be done because they feel as though their voice fell on deaf ears.
Therefore, the individuals who signed or started a petition for deportation (and/or stripping the citizenship) of those individuals exercising their Constitutional rights should be deported and stripped of their citizenship as an enemy of the Constitution of the United States of America.