There was a reorg at my company and my job duties changed. Pre-reorg I was doing data analysis (I'm a statistician), post-reorg I was assigned non-data analysis duties (more like a business analyst).
To me it seems like a breach of contract if your employer changes your job duties following a departmental reorganization. You sign on with a company to perform a specific duty unless the job description explicitly states you may be reassigned without warning. I can imagine how my supervisor would feel if I told him "There's been a reorg, I'm no longer going to do x, instead I'm working on y now." :-)
Am I missing some fine print somewhere that allows a company to reassign job duties without the consent of the employees? I do not have a formal employment contract, but I did receive an offer letter that stated salary and job duties, which I assume is the de facto employment contract.
I understand finding another position either within or without the company is (sometimes) an option, but that places the burden on the employee, when it ought to be on the employer in my estimation.