I learned the hard way to not underestimate how competitive and treacherous some people can be in the workplace. I was a long-term contractor in a large company and had an incident where I confided to another employee about some issues I was having negotiating my pay at contract renewal time. I never mentioned any numbers, just that a manager had previously promised me a pay-raise and was not honouring their word. Within two hours I was called into a senior manager's office to be reprimanded for discussing this matter publicly. In retrospect I can see the warning signs exhibited by this employee that I had ignored, and I now see that I should have kept this to myself, however I worked very closely with this employee and felt that this employee would keep what I had told them in confidence. After this incident I saw many other examples of how duplicitous this particularly employee could be when they felt threatened by the ability of others. Ultimately I was not disciplined, but I learned a valuable lesson in the process. For anyone wondering why this was an issue in the first place: It's generally a policy to keep pay and pay negotiations confidential. Employers fear the friction that can result if an employee discovers that they're being underpaid.