Sobibor was a Naziextermination camp that was part of Operation Reinhard. Jews, Soviet POWs, and possibly Gypsies were transported to Sobibor by rail, and suffocated in gas chambers that were fed with the exhaust of a diesel motor. About 260,000 people were killed in Sobibor.
... However, in December 1991, parliament repealed the one-party section of the constitution. By early 1992, several new parties had formed, and multiparty elections were held ...