In the 1950s socialist self-management was introduced, which reduced the state management of enterprises. Managers of socially owned companies were supervised by worker councils, which were made up of all employees, with one vote each. The worker councils also appointed the management, often by secret ballot. The Communist Party (later on the League of Communists) was organized in all companies and most influential employees were likely to be members of the party, so the managers were often, but not always, appointed only with the consent of workers who happened to be members of the party. There were occasional tensions between market-oriented managers and worker representatives. Although GDP is not technically applicable or designed to measure planned economies: in 1950 Yugoslavia's GDP ranked twenty-second in Europe.