Rubuta ci gaba don wannan sakin layi - A cikin Janairu 1933 NSDAP (Jam'iyyar Nazi) ta karɓi iko kuma ta rasa ɗan lokaci a sauya zuwa gwamnatin jam'iyya ɗaya a Jamus. Dukkanin jam'iyyun siyasa (ban da Jam'iyyar Nazi) yanzu sun zama ba bisa doka ba, amma sabon Chancellor, a cikin adawa, ya kasance musamman game da Jam'iyyar Kwaminis. A watan Fabrairun 1933 Roscher ya yi hijira zuwa Czechoslovakia. Ya koma Jamus kuma ya zauna a Dresden a watan Agusta na 1933, ya ci gaba da aikin jam'iyyarsa (yanzu ba bisa ka'ida ba), amma a watan Disamba na 1933 ya koma Prague, a asibiti, godiya ga rashin lafiyarsa. Daga baya, wataƙila a cikin 1934, jam'iyyar ta aike shi zuwa Kharkiv (a wancan lokacin a cikin Tarayyar Soviet) inda ya yi dogon farfadowa kuma ya kuma yi aiki a matsayin mai koyarwa ga Jam'iyyar. Tare da barkewar yakin basasa na Spain, a cikin 1936, ya shiga Brigades na Duniya. A Spain ya yi yaƙi a cikin Edgar André Bataillon. Duk da haka, ya ji rauni sosai a cikin fada a waje da Madrid
a watan Nuwambar 1936 bayan da ya koma Paris wanda shine inda Jam'iyyar Kwaminisanci ta Jamus ta kafa hedkwatarta. A watan Afrilu na 1939 aka kai shi Tarayyar Soviet inda aka sa shi a gidan hutawa don mayakan da suka ji rauni daga yakin basasar Spain, wanda aka kafa a Peredelkino, wani yanki da ke kusa da Moscow. A nan ne ya mutu a Agusta 1940.