Critics of Scientology, including former Scientologists, have compared the RPF with the gulag system of the Soviet Union. Leaving the Sea Org, even from the RPF, results in what Scientology calls "freeloader debt" or a "freeloader's bill": retroactive billing for any auditing received or any Scientology training received while in the Sea Org, which can run into tens of thousands of dollars. While this "freeloader debt" is not legally binding, many former Scientologists have reported that they felt trapped by the "freeloader debt" policy.