also the center of various kinds of craft and small trade. A tradesman's union was formed in 1920. Development of the ironworks continued; 4,567 workers were affiliated to a greater or lesser extent with KID by 1937. Italy occupied Jesenice on April 11, 1941, with the Germans taking over eight days later. This resulted in immediate arrests of some of the workers' leaders, educated and culture-affiliated individuals, and all of the Romany people. Forced mobilization and recruitment followed soon after. The Germans were aware of the strategic and industrial importance of Jesenice, so they soon began with a program of assimilation, introducing school teaching in the German language only, while they also Germanized public signs, and more. These measures led to the formation of the Partisan movement in Jesenice, including the Cankar Brigade. The steel industry was again diverted to German military needs, and the German management started importing French workers, followed by Italian workers after Italian capitulation in 1943. Sabotage of the German-led steel industry was problematic, because people were more sympathetic to the resistance, which by the end of the second world war proved to be ineffective. Before the end of World War II, Jesenice had undergone a severe sabotage-bombing by Allied forces, which came in two waves on March 1, 1945. There were many casualties, and great damage was done to the town's center, including the destruction of the train station. The ironworks secondary school was founded by KID on November 19, 1938. The first high school was established at the end of the war in 1945, for which KID also founded a staff-apprenticeship school in 1938. Second half of the 20th century With the end of World War II followed a new economic golden age. Soon after the war, two more smelting furnaces were put into operation. The Jesenice ironworks became one of the main steel manufacturers, charged with the rebuilding of the newly founded Socialist Federal Republic of Yugoslavia, and started employing more people than ever before. Many more industrial plants were built to increase production, while Jesenice began to develop into its present shape. As the population also increased with new immigrant workers, massive building of apartment blocks, and residential sections took place. Cultural, sports, school, medical and traffic infrastructure was built. Jesenice became the center of black metallurgy in Slovenia. Introduction of electrical steel processing marked the era of manufacturing steel of higher