Reductio ad Hitlerum
Reductio ad Hitlerum (Latin for 'reduction to Hitler'), also known as the Hitler fallacy or playing the Nazi card, is an attempt to invalidate someone else's argument on the basis that the same idea was promoted or practised by Adolf Hitler or the Nazi Party. Arguments can be termed reductio ad Hitlerum if they are fallacious (e.g., arguing that because Hitler abstained from eating meat or opposed smoking, anyone else who does so is a Nazi).