In all democracies, the public has a right to demonstrate in public in a peaceful manner, but it does not have the right to demonstrate where it will, when it will and how it will. The police can impose reasonable restrictions on the right to demonstrate for maintaining law and order.
In Washington, there are restrictions on demonstrations in the vicinity of the White House, the Vice-President’s house, the Pentagon and the State Department. Similarly, in London, there are restrictions on demonstrations near 10, Downing Street and the Buckingham Palace.