A cover-up is an attempt, whether successful or not, to conceal evidence of wrong-doing, error, incompetence or other embarrassing information. The expression is usually applied to people in authority who abuse their power to avoid or silence criticism. Those who cover up may be those responsible for a misdeed or their allies, or simply people with an interest in silencing criticism. source: Cover-up - Wikipedia, the free encyclopedia I do not agree there has to be a conspiracy, before a cover-up can take place and nither does Wiki.
First, Wiki is a source for sources, not a source. Second, describe a cover-up on any scale that doesn't involve more than one person.