Abstract“…that you must have to stop working here.” How Sergej Chakhotin was forced to leave the Kaiser Wilhelm Institute at Heidelberg in 1933. ‐ In this essay the author presents some basically unpublished material according to the dismissal of the Russian natural scientist Sergej Chakhotin, a former assistant of I. P. Pavlov. Chakhotin, who got a sholarship granted by an American institution, worked since 1930 at the newly established Kaiser Wilhelm Institute at Heidelberg, as a scientist. Moreover, he practically engaged (...) himself in the political struggle of the German Social Democrats against Nazism and, in 1932, created the at that time well‐known symbol of the Three Arrows. But he was ‐ being a Soviet citizen ‐ a guest in Germany. His political activity was the very reason for his discharge in April, 1933, and even the engagement of some prominent academic collegues was not able to stop the administration measure. So Chakhotin became a political refugee like some of his German collegues. (shrink)