Its obviously a bit difficult to understand the true dynamics of this but I would say before trying to take any action that the council needs to make sure its house is in order. In other words, grievance and disciplinary procedures are in place and understood by all, grievance and disciplinary panels are in place and members understand how they operate - you may need some professional HR assistance to achieve this. Then, it is a case of addressing inappropriate behaviour (eg. describing the council as corrupt [assuming it isn't!] in accordance with this procedures.