Agents can enter buildings without warrants under limited circumstances. It's not a hard bar.
Ordinarily when any crime is in plain view or in chase of a fleeing suspect, or (dubiously) when the individual is believed to be part of a proscribed organisation.
Administrative warrants are okay when there's a specific record of an individual being there. Like if the website for the organisation posts the person as being an employee amongst other reasons.
Regardless, none of these bar the deportation of people caught up.
Horrifying is just your opinion. What's fact is all these are just objections to deportation of people not supposed to be in the country.
They can file their civil rights claims
