Simply put, Keep him on. He has infiltrated an organisation that has committed multiple crimes over the past and his police loyalty enforces him to arrest every member of the KKK that has been inolved in crimes. This will obviously take all of his time, so he will be moved from any other position of responsibility so as not to create a conflict of interest.
If he is unwilling to do that, then he is suffering a moral lapse of judgement, and must be retired from active duty, and docked pay until he does complete his job. (With possible psychiatric testing.) Of course, the police will be letting the KKK know that he didn't infiltrate them, via the papers.
If he is unwilling to do that, then he is suffering a moral lapse of judgement, and must be retired from active duty, and docked pay until he does complete his job. (With possible psychiatric testing.) Of course, the police will be letting the KKK know that he didn't infiltrate them, via the papers.