Not everyone can afford big guns and heavy armor; nor have the training/licensing required to cary/display them.

3D printed whistles are a cheap and easy aid. Every bit of resistance helps.

a whistle won’t stop these goons from harming you.

No it will not, but it will alert everyone around you to ICEs presence so they can have an opportunity to be somewhat prepared.

You’ll at least give your neighbours a chance to put some pants on, hide, barricade, or even arm themselves; before ICE tries to kick in their door.

It also calls others to your aid; quickly forming mob that out numbers ICE, forcing them to focus on crowd control instead of targeted kidnapping.

Back in my day, (shakes cane), Teamspeak and Ventrillo were the big voice chat platforms/tools. Both have text chat and channels/rooms; but their focus is voice chat for gaming.