It’s not a dumb question. Asking questions to gain knowledge is a good thing. Here you go.

https://en.m.wikipedia.org/wiki/United_States_Immigration_and_Customs_Enforcement

It’s not illegal, so I think ICE terrorists are getting what they want if people are afraid to exercise their constitutional rights.

From their site:

Is this service illegal?

No. Reporting, documenting, photographing, videotaping any law enforcement officer or law enforcement activity in plainly visible public spaces is protected under the First Amendment of the US Constitution. StopICE exists in the interest of free speech, transparency and public reporting. ACLU: You Have The Right to Record Law Enforcement Officers.