The people behind US political violence (Part 1 of 2)

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There is a disturbing new wave of political street violence in America. Groups on the far right and the far left have clashed in New York, Berkeley, California, and Charlottesville, Virginia. But one liberal enclave is the main battleground: Portland, Oregon - a progressive city in the Pacific north-west. BBC Trending has visited Portland to meet two activists who have traded insults and threats online, as well as confronting each other in the streets. What drives anti-fascist Luis Enrique Marquez? And why has marijuana farmer Rob Cantrall joined the Proud Boys, which one anti-extremism organisation has dubbed a hate group? Presenter: Mike Wendling Producers: Linda Sills and Natalia Zuo (Photo: Anti-fascist activists line up in front of police in Portland. Credit: Getty Images)