From The Local:
Police said 150,000 people turned out to protest, a figure immediately contested by organizers who said one million opponents of the law had shown up.
Some of the far-right activists briefly unfurled a banner at the ruling Socialist party's headquarters urging President Francois Hollande to resign.
As the protesters dispersed, after a largely peaceful march, police said up to 500 people began attacking them by throwing metal barriers, smoke flares and beer bottles.
The youths shouted slogans against the government such as "Socialist dictatorship" and also threw objects at journalists covering the event.~Fears of unrest at Sunday's protest had been fueled by violence that erupted earlier this month during celebrations marking football club Paris Saint-Germain's league victory, which saw tourists attacked and shop and car windows smashed.Some 4,500 security forces were mobilized for Sunday's demonstration that was billed as a last-ditch show of force by opponents of the bill allowing same-sex marriage and adoption, which was voted into law on May 18th following months of bitter protests.