I’d like to see an example of a case where there was a conflict between an agency making a “decision” where they didn’t have specific statutory authority to do so.

I’d like to see an example of a case where there was a conflict between an agency making a “decision” where they didn’t have specific statutory authority to do so. I’d like to see a brief explanation detailing the case including  what decision they made and why they did not have proper authority. I’d like to see an explanation on what happened due to them not having appropriate authority.