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In page Cover-up:

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Initially, a cover-up may require a lot of effort, but it will be carried out by those closely involved with the misdeed.[citation needed] Once some hint of the hidden matter starts to become known, the cover-up gradually draws all the top leadership, at least, of an organization into complicity in covering up a misdeed or even crime that may have originally been committed by a few of its members acting independently.[citation needed] This may be regarded as tacit approval of that behaviour.[citation needed]