The agents in this case did no such thing. As far as I am aware this has not happened anywhere.

There is no suggestion that the agents conducted a search or entered a non-public area. And this has nothing to do with the claim that the judge actively obstructed their efforts.

The warrant of the judge's arrest strongly suggests that she did not think it was appropriate for ICE to arrest Ruiz and took actions to prevent it from happening.

I don't blame them. If I were them, I would do the same thing. However, as someone with the ability to vote and influence (to a very small degree) public policy, I would prefer we move toward a system in which strong labor rights exist in this country, and this is simply impossible in an environment in which employers are free to hire labor off the books for "pennies". To be clear, I think both political parties in the US are terrible, and all of this debate serves the interests of the employers that benefit from this situation.

Might it be because the federal government simply did not need to exercise much authority over the states? As a non-expert I am curious. I am continually amazed by how much authority is delegated to the states and local jurisdictions in the United States (e.g. matters of marriage, property, voting, etc.). As I understand even citizenship was handled by local courts up until very recently.