Is there any expression which denotes either
- The act of blindly and dogmatically following rules/instructions without regard for the practicality of doing so (For example, this would be an epithet which someone may use to refer to another person who reprimands him/her for riding a bike on a sidewalk, which is presumably not disturbing anyone other than the person reprimanding the rider)
- A person who does the above?
The closest examples I can come up with are Spießer, Spaßbremse or someone who is kleinkariert. Still, none of these directly denote the above behaviour but, instead, the people described by these terms might do the above (but not necessarily so).