The March 14 directive, signed by Attorney General Pam Bondi, uses an obscure 18th-century law — the Alien Enemies Act of 1798 — to give law enforcement nationwide the power to bypass basic constitutional protections.
According to the memo, agents can break into a home if getting a warrant is “impracticable,” and they don’t need a judge’s approval. Instead, immigration officers can sign their own administrative warrants. The bar for action is low — a “reasonable belief” that someone might be part of a Venezuelan gang is enough.
This article implies that you wouldn’t be breaking the law if you shot a cop entering your home unannounced and without a warrant:
https://campbelllawobserver.com/cops-not-robbers-the-clash-between-no-knock-warrants-and-the-castle-doctrine/
It also says that the cops are allowed to kill you, so having followed the law and being innocent will be small comfort.