The historic Esplanade des Invalides was a sea of protesters waving trademark pink and blue flags, while far-right demonstrators hung a banner on the ruling Socialist Party headquarters calling for President Francois Hollande to quit.
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The protests, which began as a grass roots campaign strongly backed by the Roman Catholic Church, have morphed into a wider movement with opposition politicians and far-right militants airing discontent with the unpopular Hollande.
BBC reports that French police put the number of protesters at around 150,000, though march organizers say the number is closer to one million.