Labour Day in France: May 1st 2002 vs. May 1st 2017

This year’s "Fête du Travail" (Labour Day) in France has a very political tone. Trade unions are divided over what strategy to adopt in Sunday’s crucial presidential run-off. Meanwhile, divisions appear at the National Front’s annual Joan of Arc ceremony. And Catherine Nicholson reports from Marine Le Pen’s final rally in Villepinte, a northern suburb of Paris.