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Unlike large customer information data breach cases that are publicly announced due to disclosure laws, many of the most intriguing insider theft, sabotage, and fraud cases never see the light of public scrutiny because companies would rather not air their dirty laundry if they don't have to. But these cases can offer valuable lessons on how insiders can be a threat in future situations. That is why the folks at the CERT Insider Theft Center work with private sector firms and law enforcement authorities to discretely study insider cases for the benefit of the industry. Since 2001, CERT has studied more than 800 cases.

Here are eight illustrative examples of the kind of damage these insiders can do to an organization.

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