I posted this comment in the original thread, but I’m also going to post it here for visibility for people interested in this.

404 Media and the EFF have been covering this pretty extensively.

404 just published a zine about ICE Surveillance, which can be found here printable in both English and Spanish.

404 also published the user manual for ICE’s database app, ELITE, which lets them find people to abduct which can be found here and a detailed article talking about it can be read here

In another article 404 talks about ICE’s two other tools, Tangles and Webloc, which ICE uses to track the locations of cellphones and determine the place of work or residence of the owner without a warrant. This can be used for example to track people who show up to protests and find out who they are and where they live. Read here

There’s also an article on how Flock cameras work if your interested, found here on 404

The Electronic Frontier Foundation put out a tool last year, Rayhunter, which aims to detect and record the use of cell-site simulators, or Stingrays, aka IMSI catchers. CSS’s mimic cell towers to spy on cell phones. The goal of the tool is to record and document the usage of these devices and report it to groups like the EFF.

The EFF also has a whole Field Guide to Police Surveillance which covers street-level surveillance tech law enforcement uses, and how they work.

On a side note: WIRED put out an article on How to Film ICE.

And The Verge did a review of the Best Gas Masks to buy.