Someone using rules to deliberately harm people

I need a word or expression for someone who is using the rules (law or just company rules) as a tool to harm other people. Below is a story of A and K as an example of this behavior.

Citizen A applies for a parking permit. Citizen A knows there is a spot behind their building, and according to the city rules, the first applicant should get it. Officer K, who processes the applications, tells A to make sure that all the paperwork is in order, and sends A to get various signatures from other offices that are marginally relevant for the application. A collects all those signatures and returns to K. Instead of accepting the application immediately, K delays it for thirty business days, the maximum amount of time allowed by the law. Finally, K sends A an answer that another signature is needed from the Historic Monuments Committee within three business days, or the application will be considered invalid, as it must be finalized in maximum 90 business days. A succeeds by some magic and presents the signed application. K does some research on the parking spots near A’s building, and rejects the application based on the fact that the building has no designated handicapped parking spot.