According to Latino Rebels, the alt-right group was there to film undocumented people, post the faces on social media, and have their followers dox them to ICE.

ICE
LexisNexis Signed $16.8 Million Contract To Sell Personal Information To ICE
The CLEAR contract was expiring and was “unclear whether the Biden administration will renew the deal or award a new contract.”
Cecilia Muñoz, Who Defended Family Separations Under Obama, Joins Biden Transition Team
“There will be parents separated from their children. We don’t have to like it, but it is a result of having a broken system of laws.”
Trump Preparing Targeted ICE Arrests in Sanctuary Cities
The Trump administration is preparing a series of immigration enforcement actions targeting sanctuary cities leading up to the November general election, sources told the Washington Post on Tuesday.