Some employers may be afraid that a worker may make a report to law enforcement, in the event that the employer's practices are illegal to the law. Other fears include the risk of sabotage by damaging machinery, erasing computer files, or shredding documents; or even violence; In some most extreme cases, fired employees have attacked or even killed their former employers or the staff at their old company or organization, sometimes known in slang as "going postal." In some cases, this has occurred several months or years after termination. Some employers terminate their staff off-site to avoid these issues, or they ban any terminated staff on their premises.