Neturei Karta is an anti-Zionist organization that opposes the existence of the state of Israel because its members believe that a sovereign Israel is contrary to Jewish law. Rabbi Dovid Weiss is associate director and is based in Monsey, N.Y. Contact via the form on its website.

Mercaz USA is the Zionist arm of the Conservative movement. It advocates for Israel and works to build ties between the Jewish diaspora and Israel. Janet Tobin is president. It is based in New York City.

The Israel on Campus Coalition advocates for Israel on college campuses, monitoring for anti-Israel bias in media and in classes. Marjan Keypour Greenblatt is acting director.

Encounter introduces emerging Jewish leaders to the issues of Palestine and its people. Yona Shem-Tov is its North American co-director.

The David Project Center for Jewish Leadership describes itself as an educational nonprofit that focuses on the Israeli-Palestinian conflict. Founder Charles Jacobs, who recently left the center, was named one of the 50 most influential Jews by Forward in 2008. The center is based in Boston and has offices in New York and Israel. David Bernstein is executive director.

The Conference of Presidents of Major American Jewish Organizations is an umbrella association of 51 Jewish organizations that fosters support for Israel among politicians, Jews and the broader community. It is based in New York City.

Brit Tzedek v’Shalom (Jewish Alliance for Justice and Peace) is a group of American Jews dedicated to a two-state solution to the Israel-Palestine conflict. Diane Kantor is executive director. It is based in Chicago and maintains a list of chapters throughout the U.S.

The Association of Reform Zionists of America speaks on behalf of Israel for the Reform movement. Rabbi Joshua Weinberg is president.

The American Israel Public Affairs Committee was named by The New York Times as the most powerful pro-Israel advocacy group. AIPAC claims 100,000 members and is based in Washington, D.C.