All of my kids have had issues with bullies at school.
The eldest was always taller than his classmates and was verbally harassed and bullied by a smaller, mouthier kid for a couple of years. The school did nothing about it until the bully crossed the line physically and young Master Scully beat the living daylights out of him. Master Scully received a two day suspension from school for that altercation, and it cost me two days' worth of lost wages. Since the school refused to intervene with our previous complaints about the little monster, I consider it a price worth paying, because the bullying stopped dead in its tracks after that. Don't get me wrong - I gave Master Scully the low-down on how wrong it is to take these things into his own hands. But I do understand how his breaking point was reached. The school was unwilling to take any action against the verbal bullying - they supposedly have a "zero tolerance" rule - but they only decided to apply it when it came to physical altercations. They are just as much at fault that it escalated to the point that it did, imo.
My youngest used to receive hate IMs from a girl in her class... including death threats. We printed out the IM conversations and emails, took them to the school principal (different school) and said we wanted the police involved due to the nature of the death threats, and if he wasn't going to help us and call the police for an issue between his students, then we would do it ourselves and include his name in the complaint. Big meeting ensued. The other girl's parents were shown the printouts of the IM conversations and emails... they were positively mortified.
Long story short, there were a few therapeutic interventions between the girls and some counsellors, and now they are friends because they discovered some things that they had in common. I'm the one who is having mixed feelings about the friendship.... wondering when all hell is going to break loose again.
Some good books on bullying:
The Bully, The Bullied and the Bystander - Barbara Coloroso
Queen Bees and Wannabes - Rosalind Wiseman
In a workplace setting, bullying goes by a different name: mobbing. It's the same activity, although it is more likely to be carried out in more subtle, emotionally destructive ways than in the form of physical altercations, and thus is more difficult to prove.
The basic premise is the same: exclusionary tactics are undertaken against a targeted individual; campaigns are launched to ostracise the targeted individual to undermine their position, sabotage their work, etc.
Titles include:
Mobbing: Emotional Abuse in the American Workplace - Noa Davenport, Gail P. Elliot & Ruth D. Schwartz
The Bully at Work: What You Can Do to Stop the Hurt and Reclaim Your Dignity on the Job - Gary Namie, Ph.D.