Conspiracy to commit a crime is typically not included in protected speech. Whether you think that's happening here will depend mostly on what side you take, I suspect.
Are you pro or against this?
Freedom of expression does not include freedom from prosecution for real crimes.
Yes, but physical impediments are physical impediments. The protesters have been repeatedly seen to impede, or attempt to impede, ICE physically.
What do you have against crime?
Nonviolent political action is often criminalized.