Interesting, I didn't know that! I wonder whether restricting the expression of only political topics at work infringes on this.
My understanding is that it would not infringe, so long as it is a party-agnostic policy.
That seems weird to me, since shouldn't political activity include at work?
Legality is not the same as morality. Remember that slaves were not a protected class at one point. A coarse analogy, I admit, but it's true: we can change this to include politics if necessary.
Yeah, it isn't, but that's a bit surprising since in many other places the same specific legal definition explicitly does include political affiliation for obvious reasons e.g. so that the employers couldn't fire someone for being a member of some labor rights or communist party or even a candidate from them.
It is in several states including CA and NY, where most tech firms are located.