If your comp package has a non-disclosure clause it's illegal. You cannot be asked not to discuss salary in the US.
> People don't want to tip off
That's why it's illegal to be prevented from discussing salary. Discuss your coworkers - you might be the one being underpaid.
Fun times =3
You can sign broken contract freely - it's unenforceable, so you can sign whatever paper HR hands to you, and only when you're retaliated against do you need to care. Which coincidentally is when you stop needing to be cooperative anyways.
Don't "YMMV" your way out of laws that protect you.
We have this thing called freedom of speech that the courts take pretty seriously (usually).
The whole don't discuss how much you get paid, because its poor etiquette is an anti-worker old wives tale created by HR people last century. Its a complete myth, but most jobs Ive worked at there's always someone who is extermely afraid to discuss the topic out of fear of breaking a non-existent rule. The psyops worked.
ymmv, as living in an ivory tower means I may be unaware of current US rules.
>We have this thing called freedom of speech
That may be an old wives tale, as corporate money is defined as speech now. =3