John Bercow was a "serial bully" while House of Commons Speaker, and would be banned from getting a parliamentary pass, a report has said.
The Independent Expert Panel said "his behaviour fell very far below that which the public has a right to expect" from an MP.
It also said his evidence showed he had been "a serial liar".
However, Mr Bercow said the inquiry into the complaints was "amateurish" and based on "tittle-tattle".
Mr Bercow was Speaker of the House of Commons from 2009 to 2019 and presided over a turbulent period during which the House of Commons debated the UK's exit from the European Union.
A report by the Parliamentary Commissioner for Standards Kathryn Stone found that Mr Bercow had displayed "threatening conduct" towards staff, including verbal abuse, and displays of anger.
It said he had "shouted at and mimicked" a member of staff and was responsible for "intimidating, insulting behaviour involving an abuse of power".
She also found he had subjected Lord Lisvane - a senior clerk in the House of Commons - to "repeated unfounded criticism… often made at length and at volume and included derogatory inferences about [his] upbringing and background".
Mr Bercow appealed but the Independent Expert Panel upheld all the findings of the Parliamentary Commissioner for Standards.
https://www.bbc.co.uk/news/uk-politics-60660385