The Siberian Confederation of Labour (Сибирская Конфедерация Труда) or SKT is a Siberian anarcho-syndicalist union, the largest union being in the city of Omsk.
The SKT membership in Omsk includes air traffic controllers, rail workers, technicians, electricians and others. Members in other towns include teachers, miners, broadcasting staff and chemical workers.
References
SKT Wikipedia(Text) CC BY-SA