The Political Gulag is an island where the Party leadership controls its members by threatening restrictions, imposing restrictions, then effecting elimination for insubordination.
A scenario (hopefully rarely occurring) in the context of a discussion on a particular piece of legislation:
Legislator X, in response to his constituency and after careful analysis of the facts, determines to vote his conscience. Party leader Y decides that the vote Legislator X intends to cast should be changed because it would conflict with the goals he has set for the Party. Party leader Y communicates his orders to Legislator X with the advice that Legislator X should vote as Party leady Y dictates or else be removed from committee membership and be opposed by the Party in the next election. In this scenario truth does not prevail, the foundation of a democracy is shaken, the good of the society is not served and Legislator X loses his self-respect.
May God liberate us from this island of tyranny.