It appears that the Chief and mayor have not only comitted felony criminal violations of federal law, both by conspiring against the rights of others and intending to do so under the color of the law they have proposed but may also be liable as racketeers for triple the amount of any costs incurred by citizens who have to take legal steps to halt their criminal activities. Happily, federal law provides that an attorney pursuing such an action against them can be paid time-and-a-half his usual fee, and can collect it from the criminals.
Accordingly, I'd suggest that a good beginning would be to have those two criminal suspects provide a listing of all personal assets and property in their possession or under their control; if they're willing to break the laws in this case there';s no good reason to think that they haven't profitted from previous crimes they've committed while masquerading as public servants.