When they tried to move me off the line I have held for eleven years, I pulled out my contract and pointed to the seniority clause. I knew my rep's number by heart and I knew exactly what to ask him. They backed off, because I knew my rights better than they did.
More people experience this than they realize.
You use your contract, rep, and seniority with real confidence.
If this sounds familiar, the Library can help you find the bigger picture.