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Gibson Guitar is the lowest rated company on the Glassdoor list. Gibson is privately held. The firm is based in Nashville. Gibson got into financial trouble in the early 1980s and was rescued by a group of investors in 1986. Gibson had several layoffs that cut its workforce by about 20% by mid-2009. There have been a number of complaints about the quality of the company's products recently. In November, it was revealed that Gibson was being investigated for violating the Lacey Act, a key piece of environmental law, for importing endangered species of rosewood from Madagascar. The alleged violation has gone over poorly with Gibson customers and may hurt sales.

Source: http://247wallst.com/2010/01/05/the-15-most-hated-companies-in-america/