Intolerance and conspiracy theories have haunted the margins of France’s ‘‘yellow vest’’ movement since the first protests over fuel taxes roused the discontented middle of French society. The men and women in safety vests blocking traffic and intimidating shoppers on the Champs-Elysees vent a range of grievances against the government.

But over 11 weeks of protests, views from the fringes have bubbled through the diffuse and leaderless movement and have been amplified: anti-Semitic rants about banking, a Holocaust survivor harassed on the subway, assaults on journalists, and claims the government concocted terrorist attacks or deadly accidents to divert attention from the demonstrations.

Read more: Boston Globe