PARIS — Protesters set fires as they blocked highways and gas stations across France early Wednesday as part of a new nationwide movement. Authorities deployed 80,000 police, who made hundreds of arrests and fired tear gas to disperse crowds. The "Block Everything" movement was born online over the summer in far-right circles, but spread on social media and was co-opted by left-wing, antifascist and anarchist groups. It now includes France’s far-left parties and the country’s powerful labor unions.

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