Friedrich Paulus was the last commander of the German 6th Army who surrendered in Stalingrad. I'm pretty sure that being a high ranking German officer on the Eastern front makes you a POS by definition, but is their any direct proof of him being a Nazi/war criminal? I know he was part of the Friekorps, and I've seen claims of him calling himself a National Socialist even after his surrender, but there weren't any sources.
Any help or references would be appreciated!
/u/kieslowskifan has previously answered So many questions about Friedrich Paulus, Field Marshal at the Battle of Stalingrad.
EDIT: If you have more information tied to OP's specific question, fire away. Few questions in history of any depth have only one answer.
EDIT2: I recently found answers for How was the relationship between West German commanders and soldiers and their Allied counterparts just after WW2?..., which describe the rehabilitation of Wehrmacht officers like Paulus in Western historiography.
EDIT3: corrected username ping