The title makes it sound like the union members did the stabbing.

French trade unions and antifascist organizations have launched a wave of mobilizations following a violent assault by far-right groups on young activists on Sunday, February 16. The attack, carried out by around 20 fascist thugs, targeted attendees of a film screening organized by Young Struggle and the Turkish Migrant Workers Cultural Association (ACTIT) in Paris. The assailants beat several audience members and stabbed one of them, a member of the General Confederation of Labor (CGT).