In the 1920s Klatt was one of the leaders of the German Youth Movement, especially involved in adult education and active leisure.
He attached great importance to community work and leisure activities to reduce stress and regenerate the creative forces.
He was also one of the contributors to the journal Die Kreatur (The Creature) co-founded in 1925 by Eugen Rosenstock-Huessy and edited by Joseph Wittig, Martin Buber, and Viktor von Weizsäcker, which lasted until 1930.
The journal published writings by authors such as Nikolai Berdyaev, Lev Shestov, Franz Rosenzweig, Ernst Simon, Hugo Bergmann, Hans Ehrenberg and Rudolf Ehrenberg who were opposed to the dominant educational theory in Germany based on idealism, positivism, and historicism.
[2] From 1930 Klatt was co-editor of the Neue Blätter fūr den Socialismus with Eduard Heimann and Paul Tillich.