"Women in Black (WiB) is a world-wide network of women committed to peace with justice and actively opposed to injustice, war, militarism and other forms of violence.

We are not an organisation, but a means of mobilisation and a formula for action. Women in Black actions are generally women only, and often take the form of women wearing black, standing in a public place in silent, non-violent vigils at regular times and intervals, carrying placards and handing out leaflets."

 http://www.womeninblack.org.uk/