There is increasing evidence that bullying is related to diversity issues - bullies often target someone who is slightly different to themselves.
It is worth remembering that next Wednesday, 7th November is the national ban bullying at work day. Bullying at work has huge costs, to the firm, to the individuals, and to the nation (estimated cost including time off and using NHS resources through related sickness is at least £1.8 billion and replacement costs of employees who leave due to being bullied £400 million)
Have a look at this website for more information:
http://www.banbullyingatwork.com/