Kraft durch Freude (German for Strength through Joy, abbreviated KdF) was a large state-operated leisure organization in Nazi Germany. It was a part of the German Labour Front (Deutsche Arbeitsfront, DAF), the national German labour organization at that time. Set up as a tool to promote the advantages of National Socialism to the people, it soon became the world's largest tourism operator of the 1930s.
KdF was supposed to bridge the class divide by making middle-class leisure activities available to the masses. This was underscored by having cruises with passengers of mixed classes and having them, regardless of social status, draw lots for allocation of cabins.
Another less ideological goal was to boost the German economy by stimulating the tourist industry out of its slump from the 1920s. It was quite successful up until the outbreak of World War II. By 1934, over two million Germans had participated on a KdF trip; by 1939 the reported numbers lay around 25 million people. The organization essentially collapsed in 1939, and several projects, such as the massive Prora holiday resort, were never completed.
Starting in 1933, KdF provided affordable leisure activities such as concerts, plays, libraries, day trips and holidays. Large ships, such as Wilhelm Gustloff, were built specifically for KdF cruises. They rewarded workers with taking them and their families to the movies, to parks, keep-fit clubs, hiking, sporting activities, film shows and concerts. Borrowing from the Italian fascist organization Dopolavoro "After Work", but extending its influence into the workplace as well, KdF rapidly developed a wide range of activities, and quickly grew into one of Nazi Germany's largest organizations. The official statistics showed that in 1934, 2.3 million people took KdF holidays. By 1938, this figure rose to 10.3 million.
Two weeks after the Anschluss, when SS-Gruppenführer Josef Bürckel became Reichskommissar für die Wiedervereinigung as well as Gauleiter, the first five trains with some 2,000 Austrian workers left for Passau, where they were ceremonially welcomed. While Bürckel announced that he did not expect all KdF travelers to return as National Socialists, he did expect them to look him in the eyes and say, "I tried hard to understand you."