Not to discourage further answers or answers from other perspectives, but I have given an earlier answer on the post-war treatment of Nazi supporters in Norway, focusing largely on the legal process against NS-members (Norwegian Nazi party members), but i do touch on other groups perceived as "collaborators" as well.

Feel free to ask followups if anything is unclear or if the answer didn't really deal with what you wanted to know. I can't really answer for the process in Denmark however.