A hearing has found the former deputy council leader of Somerset County Council guilty of two counts of breaching codes of conduct.
The two-year investigation looked into dozens of complaints about the behaviour of Liberal Democrat councillor Paul Buchanan.
Mr Buchanan has been disqualified from being a councillor for two years.
The tribunal heard he made written allegations of serious misconduct against chief executive Alan Jones.
‘Act of revenge’
On Wednesday the panel ruled Mr Buchanan had “brought the office of [the] member into disrepute” and “used his position as a member to confer a disadvantage on Mr Jones”. He was disqualified from local government for two years.
Panel chairman David Laverick said the respondent “was motivated by a desire to cause harm to the chief executive”.