There is a cycle within the cycle: The more a target is bullied, the more anxious, nervous and fearful they become. They are less likely to stand up for themselves and more likely to be bullied even more.
In the rare instance that a target goes to upper management for help, organizations tend to sweep the problem under the rug, or in some cases, make the situation worse
Targets learn that the organization is not going to do anything to help them
When a manager really wants to get rid of a target, some make the work environment so problematic, hostile, abusive and difficult to cope with in order to push the target out. This is called "constructive discharge" because, while the target chose to leave, they would not have if the situation had not been purposefully created to force them out.
Due to a. the manager getting away with the abuse, b. the organization failing to respond and c. coworkers acting as enablers, the cycle eventually restarts with a new target
Unfortunately, some bullies continue to bully even after the target has left the organization. They engage in a type of blacklisting where they sabotage the target's attempts at obtaining a new job.
If you are being bullied and need to talk to someone, call the National Suicide Prevention Lifeline at 1-800-273-8255 or visit online at suicidepreventionlifeline.org