Three Labour MPs and one Tory peer will face criminal charges over their expenses, Director of Public Prosecutions Keir Starmer has said.
MPs Elliot Morley, Jim Devine, David Chaytor and Lord Hanningfield will face charges under the Theft Act.
In a joint statement the MPs said they refuted any charges and would "defend our position robustly".
Labour peer Lord Clarke will not be charged but a sixth case remains under investigation.
Police have investigated a handful of cases since expenses revelations were published last May.
In an announcement outside the headquarters of the Crown Prosecution Service, Mr Starmer said files had been reviewed carefully by senior CPS lawyers aided by "an external and highly experienced criminal QC".
"In four cases, we have concluded that there is sufficient evidence to bring criminal charges and that it is in the public interest to charge the individuals concerned," he said.
http://news.bbc.co.uk..._politics/8499590.stm