Speaker of the House
Some have been stripped of their parliamentary passes for breaching the Palace of Westminster's security cordon.
The bulk of those affected were not informed for months after the incident.
John Bercow has made headlines worldwide for moving to block a third vote on Theresa May's Brexit deal. But as Speaker in the House of Commons, is this out of the ordinary? We look at what the role means, both past and present, and what the speaker is actually allowed to do.
MPs say revelations are bringing Westminster into disrepute.
MPs say revelations are bringing Westminster into disrepute.
PM writes to Commons Speaker urging a crackdown.
Speaker has angered Tory MPs with 'Remain' vote
He says many are furious at the Speaker's intervention in the Trump visit row.
Commons Speaker told his position is 'untenable'