"Enunciation of the principle of equality among human beings in the sight of God is important and necessary, but it is not sufficient. Realization of equality involves such matters as independence and control of one's own life. Therefore Friends aid the nonviolent efforts of the exploited to attain self-determination and social, political, and economic justice, and to change attitudes and practices formerly taken for granted. Friends seek to bring to light structures, institutions, language, and thought processes which subtly support discrimination and exploitation. Beyond their own Society, Friends promote Spirit-led, sense of the meeting decision-making as an instrument of equality. And Friends continue to examine their own attitudes and practices to test whether they contribute as much as they might to social, political, and economic justice.
"Friends work with groups that have been victimized by prejudice and exploitation. Too often this work has been difficult because of resistance by the prejudiced and by the exploiters, even within the membership of the Religious Society of Friends. The problem of prejudice is complicated by advantages that have come to some at the expense of others. Exploitation impairs the human quality of the exploiter as well as of the exploited."
(Source: PYM's Faith and Practice)
American Friends Service Committee: Founded in 1917, "the American Friends Service Committee carries out service, development, social justice, and peace programs throughout the world."
Tolerance.org: "Tolerance.org is a principal online destination for people interested in dismantling bigotry and creating, in hate's stead, communities that value diversity." (Not specifically Quaker)