War II he was imprisoned and tortured by the Gestapo. He died of wounds sustained in prison. Interwar period In the years 1919 – 1939, princes Lubomirski served as Members of Parliament, senators, and in the ministries. They were also engaged in the industrialization of the country. They belonged to the key organizations involved in the modernization of roads, railways, and aviation. They took part in the reconstruction of the Polish army. They formed banking centres and credit unions, which provided cheap loans to the poorest, and were active in educational organizations, financing schools, as well as being engaged in Polish culture. Prince Stefan Lubomirski (1862 – 1941) was a founder of the Polish Olympic Games Committee (later the Polish Olympic committee, PKOL), becoming its first president (its next president being his cousin, Prince Kazimierz Lubomirski), and a member of the International Olympic Committee. Prince Stefan was passionate about racehorse breeding, forming with his brothers the most modern horse-breeding farm in Poland at Widzów manor near Częstochowa. Stefan was the owner of the Warsaw Commuter Railways (Warszawska Kolej Dojazdowa) company, which created the narrow gauge passenger and freight railways of Grójec, Jabłonków, and Wilanów. Railways allowed capital city dwellers to reach factories located outside the city and residents of suburban areas to get to the capital city. During World War II, the railways built by Lubomirski delivered supplies to the occupied city and brought employees to Warsaw offices and factories. Prince Stanisław Sebastian Lubomirski established the central union of Polish industry Leviatan, where he was the president from 1932. The union promoted the ideas of development of industry – lowering taxes, social security benefits for workers, and increasing state aid to industry. Members of the organization were elected to the Sejm, the Senate, were members of governments of the Second Republic of Poland, and served other state institutions. They published three magazines: Economic Review (Przegląd Gospodarczy), The Polish Courier (Kurier Polski), and The Telegram (Depesza). Stanisław Sebastian established the Industrial Bank of Warsaw SA (Bank Przemysłowy Warszawski S.A.) and was the president of the Commercial Bank (Bank Handlowy) in Warsaw, the Central Union of Polish Industry (Centralny Związek Przemysłu Polskiego), the Polish Bank Association (Związek Banków Polskich), and the Association of Polish Industrialists (Stowarzyszenie Przemysłowców Polskich). He devoted his life to the struggle for the independence of the Polish economy from the influence of the partitioners, and, after regaining independence,