Eisler wrote music for several Brecht plays, including "The Decision (Die Maßnahme)" (1930), "The Mother" (1932) and "Schweik in the Second World War" (1957). They also collaborated on protest songs that celebrated, and contributed to, the political turmoil of Weimar Germany in the early 1930s. Their "Solidarity Song" became a popular militant anthem sung in street protests and public meetings throughout Europe, and their "Ballad of Paragraph 218" was the world's first song protesting laws against abortion. Brecht-Eisler songs of this period tended to look at life from "below"—from the perspective of prostitutes, hustlers, the unemployed and the working poor. In 1931–32 he collaborated with Brecht and director Slatan Dudow on the working-class film "Kuhle Wampe".