Mistake. Again.
You are making a false equivalence between Federal Law Enforcement Officers carrying out their legal responsibilities (ICE) and a mob (Antifa).
The people harassing ICE officers should be arrested and imprisoned.
No public action should be required.
If the state does not want to protect its officers, then don't send them.
You must be living in that perfect world where local police and prosecutors actually do their duty according to the law.