Remember:
These are organizations who strive to educate people about stereotypes. These might be helpful in locating statistical evidence.
AAUW - Gender Equity
ACLU - Multiple
Amnesty International - Women's Rights
CLASS Action - economic inequality (income, money, and wealth)
Equality and Human Rights Commission - Multiple, UK-perspective
GLAAD - Sexual Orientation
Human Rights Watch - GLBTQ+
United Nations: Let's Fight Racism - Global Racism
United Nations: Human Rights - this page focuses on ableism