Trump's DHS appointees have dismantled civil rights protections, allowing agents to wear masks and remain anonymous, while also targeting groups that oppose them.
ProPublica, a nonprofit newsroom, has investigated abuses of power and reported on the violent tactics used by federal police.
Recordings of emergency calls captured the terror residents felt as they watched masked men ambush people and force them into unmarked cars.
Author's summary: Trump builds a violent federal police force.