National Socialist Motor Corps
Widmann was not particularly involved in politics. However, in July 1933, as a student, Widmann joined the National Socialist Motor Corps ("Nationalsozialistisches Kraftfahrkorps", NSKK). He was admitted into the Nazi Party in May 1937. After Widmann joined the KTI, in December 1939 he was transferred from the NSKK to the SS with the rank of SS-"Untersturmführer" (second lieutenant).