Amazon recently revealed that it fired a German security firm, Hesen European Security Services, after temporary workers in its facilities abroad complained of mistreatment in a public documentary.

“Amazon has a zero tolerance limit for discrimination and intimidation and expects the same of other companies we work with,” Amazon told the Associated Press, noting that the move was effective immediately. Apparently security workers dressed in neo-Nazi attire, although the firm has said that the allegations are not true.

The security firm is currently being investigated and it’s possible it will lose its license to operate in the future.