NO NO NO ....say it isnt so...

I tried to turn the clutch on the ac compressor, and it would not budge....but you cant actually get your hand around it...the space is just too tight. You can only push on the side of the wheel. So, I go over to my other 1990 300TE that is currently down for suspension work, and tried to turn that one. It does have resistance, but it will turn when you apply that side push down motion. I go back to this car...apply the same motion...it will NOT budge!!! Is it what I think it is? Is the compressor shot?
Is there another step before declaring a state of emergency
Thanks