Karl Rainer began his football career at FC Sturm 07. Then he went to the first division club First Vienna FC 1894. Karl Rainer was a regular player for Vienna between 1921 and 1938. He played 882 matches for Vienna .
National team
He played 39 matches for the Austrian national football team between 1924 and 1935.
Manager
In the early 1940s, Rainer was the coach of SC Wacker Vienna. In 1942 he played again for Vienna due to a lack of players. After the end of the war he worked as a coach at Wiener AC, Vienna and SC Justiz.
Rainer and the NSDAP
On 16 August 1940, Rainer applied for admission to the NSDAP and was admitted on 1 October (membership number 8,458,973).[2] According to Eva Menasse, in October 1938 he "aryanized" the apartment of her grandparents Richard and Adolphine Menasse at Döblinger Hauptstraße 13.[3]
