If I am the supervisor I would set a meeting and discuss the issue at hand, pinpoint the weak areas of performance and provide a clear path on how to improve.
One option is the word coworker.
Report it to your boss but tell the boss you want to remain anonymous.
Visit www.bullyonline.org and see if they are a (serial) bully would be a good start. Even if they are not, it will give you some good tips on how to deal with this person.
Hiring that coworker
If they broke a policy, you need to give them a warning. If they break the policy again, you can fire them.
The team were performing well in the first half of the match.
He was very happy.
VIOLENCE AT WORK: The verbal, or body language threatening of a worker by other coworker/s, or management personnel while the threatened worker is performing his duties.
ex-coworker
My coworker got promoted before I did.
ex-coworker
forming, storming, norming, and performing