(27.Mai) Demonstrations almost always help strengthen and focus a movement and keep an issue in the public eye. But they have also helped launch campaigns and revolutions, win the vote, overturn hated laws and bring down regimes.
Marches are always part of a wider process of organising and resisting, but as this (by no means definitive) list shows, they can be a catalyst for strikes, occupations and all sorts of civil disobedience. They are an indispensible method of bringing activists together with the much wider social base necessary for real change.