Ex-employees are increasingly seeking revenge on their former employers. Here's how companies can fight back:

-- Terminate employees' computer access just before they are handed pink slips

-- Inform workers that divulging company secrets and intruding via computer are serious crimes

-- Treat laid-off workers with respect: Most cases of corporate sabotage and hacking are inside jobs

-- Require remaining employees to change passwords

-- Sweep the computer system to detect intruders

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