In 1939, at the beginning of World War II and the German occupation of Poland, Tuwim emigrated through Romania first to France, and after France's capitulation, to Brazil, by way of Portugal, and finally to the US, where he settled in 1942. In 1939-41 he collaborated with the émigré weekly "Wiadomosci Polskie", but broke off the collaboration due to differences in views on the attitude towards the Soviet Union. In 1942-46 he worked with the monthly "Nowa Polska" published in London, and with leftist Polish-American newspapers. He was affiliated with the Polish section of the International Workers Organization from 1942. He was also a member of the Association of Writers From Poland (a member of the board in 1943).