Supreme Court rules California farms can keep union organizers off private land

[FBaggins]

7. There's no right to assemble on someone else's property

Nor does the dissent argue that such a right exists.

The state (CA) created a regulation that would create a right to perform union organizing tasks on someone else's property (for a limited number of hours/days per year).

I obviously haven't read the entire thing yet, but it doesn't even look like SCOTUS is saying that California can't do that. It's just that creating such access is a "taking" and thus can't be done by the state without just compensation for the limitation of those property rights.