My Great Grandmother was born in Germany in 1908 and immigrated to the U.S. around 1923. On her death bed she mentioned in a fit of panic for my mother, who she mistook for my grandmother, to "hide the children from the Russians". While I understand that a fear of Communists existed in Germany during the period of her life in Germany, I am wondering if there were any reasons other than Russians being associated with Communism, that led to this feeling of animosity amongst Germans.
Germany had only recently become a unified nation by World War I. In 1923, World War I was a few years past. Prior to the German Nation, the Prussian Empire encompassed much of modern Germany. Russia and Germany have a strong history of alliance and war, likely contributing to the common fear each felt toward the other.