Cover-up

Front page of the newspaper L’Aurore of Thursday 13 January 1898, with the famous open letter J'Accuse…! written by Émile Zola to the President of France about the Dreyfus Affair. The headline reads "I accuse! Letter to the President of the Republic". See J'accuse...!, the whole text on Wikisource

A cover-up is an attempt, whether successful or not, to conceal evidence of wrongdoing, error, incompetence, or other embarrassing or criminalizing information. Research has distinguished personal cover-ups (covering up one's own misdeeds) from relational cover-ups (covering up someone else's misdeeds)

The expression is usually applied to people in positions of authority who abuse power to avoid or silence criticism or to deflect guilt of wrongdoing.