[wideawake]

What contract is that?

Same contract you signed when you agreed to pay your state taxes.

It should no be illegal to withhold one's work from an employer.

Not when your refusal to work injures a third party.

[BikerNYC]

Oh, for god's sake. When my doorman strikes, it injures me.

You tolerate far too much government control over the lives of people then I prefer. But, that's your right.

This is a matter between the MTA and its workers. Workers don't show up, they get fired. End of story. No interference by the heavy hand of the courts. It's really not that difficult.