Whistleblowers must be given proper support so they have the courage to come forward, the chair of the Commons Public Accounts Committee has said.
Margaret Hodge revealed six out of 10 people would not speak out over fears of reprisals from bullying colleagues.
She told ITV News there must be tougher government sanctions against this so it does not have a detrimental effect on uncovering scandals in the future.
More top news
The pilot of the missing MH370 plane plotted a course to the southern Indian ocean on a home flight simulator, investigators have said.
Joe Campbell said he wanted to adopt Kiran Sheikh but was told he couldn't because he wasn't married.
Annual rail figures reveal the most overcrowded service in spring/autumn 2015, was an early morning train from Brighton to Bedford.