Tens of thousands of people gathered in Hamburg on Sunday ahead of a march through the inner city to demonstrate opposition to right-wing extremism in Germany. The organizers said that more than 50,000 people to marched under the slogan “We are the firewall – together against right-wing extremism.” Police said they would issue its estimate of the crowd’s size after the rally ends. The demonstration was the third of its kind in Hamburg since the start of the year, and cities across Germany have seen regular marches since it emerged that members of the far right had met to discuss mass deportati…