Cable News Clips

https://duckduckgo.com/?q=fake%20ICE%20agents&ko=-1&ia=web

Or use your favorite search engine. I typed fake ICE agents (no quotes).

Amazon has been selling lookalike ICE tactical gear, and there's no standard uniform anyway, even for the supposedly-"legitimate" ICE agents.

Just for examples:
Brooklyn, attempted rape
https://abc7ny.com/post/brooklyn-attempted-rape-woman-says-man-posed-ice-agent-before-attempting-sexually-assault-heights/15897592/

Florida, kidnapping
https://lawandcrime.com/crime/suffer-the-consequences-of-her-husbands-actions-woman-dressed-as-ice-officer-and-equipped-with-walkie-talkie-kidnaps-ex-boyfriends-wife-cops-say/

South Carolina, Philadelphia
https://www.nbcnews.com/news/us-news/men-two-states-are-accused-impersonating-ice-officers-rcna190446

Tons more top hits are videos, with news clips and bystander recordings, but those load slowly for me. They include California's AG warning people there, along with LA school district reports/warnings of fake ICE agents outside schools. A number of fake ICE trucks were a problem in Washington state.

California is seeing an increase in ICE agent impersonators, AG says. How to spot fakes
Read more at: https://www.fresnobee.com/news/local/article302306749.html#storylink=cpy

https://ktla.com/news/local-news/lausd-aware-of-fake-ice-agents-approaching-students-third-day-of-school-walkouts-planned/

The ones that aren't violent crime are pure trumpist terrorism. This guy detained a group of Latino men:
https://www.9news.com.au/world/people-arrested-impersonating-ice-officers-amid-deportation-crackdown-us/3d4dbdcf-5c88-45ab-8e34-e46543ed0dd0