The anti-Immigration and Customs Enforcement protests in Bushwick on Saturday night included a tight-knit group of young semi-pro protesters, familiar from previous clashes with cops. This network of Gen Z agitators — largely young, upwardly mobile transplants to New York City — seem intent on picking a fight with authority first and cause second, moving seamlessly from climate activism to anti-Israel protest and now anti-ICE and immigration enforcement. They organize through decentralized non-public networks, such as Discord and encrypted messaging apps, which you have to be a vetted member to join, according to sources, which is how they got word out that ICE was at the Wyckoff Heights Medical Center on Saturday night. The far-left flash mob of about 200 activists threw garbage onto the streets and hurled trash cans at vehicles, shouting obscenities and attempting to disrupt traffic.…