• Emmanuel Macron and Marine Le Pen, the two French presidential candidates, received starkly different welcomes from striking factory workers in Amiens, Mr. Macron’s hometown.

Mr. Macron was booed as tires burned, while Ms. Le Pen was greeted with hugs and selfies.

Their separate visits, covered live on French television, showed how Ms. Le Pen’s antiglobalization message resonates in regions struggling with job losses.