"The political prisoner’s words or deeds have in one form or another embodied political protests against the established order and have consequently brought him into acute conflict with the state. In light of the political content of his act, the “crime” (which may or may not have been committed) assumes a minor importance. In this country, however, where the special category of political prisoners is not officially acknowledged, the political prisoner inevitably stands trial for a specific criminal offense, not for a political act."