John Profumo
Profumo's political career was ruined by a combination of events. He and his wife accepted an invitation from Lord Astor to spend a weekend at his country estate, Clivedon. During that weekend he saw Christine Keeler get out of the swimming pool naked. Profumo asked for her phone number, and they became lovers. Unfortunately for Profumo, she was also having an affair with  the Russian naval attaché and spy, Yevgeny Ivanov. When MI5 discovered this from a tip-off, Profumo ended the affair. Rumours circulated, and he was directly challenged about his relationship  in the House of Commons. In a personal statement to the House of Commons, Profumo denied the accusation. This was perhaps his biggest mistake. He  eventually confessed his affair, and  resigned from the government and from Parliament.