Below please find the link to a superb research dossier about J Street by The Investigative Project, led by Steve Emerson, who is an American patriot, smart, articulate and a man of integrity.
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J Street and its affiliate organizations, JStreetPAC, J Street Education Fund, and J Street U, claim to be “pro Israel” but routinely adopt anti-Israel positions, provide a platform to Israel “bashers” and offer tacit support to the BDS (Boycott, Divest, Sanctions) campaign against the Jewish state. The organization, founded and headed by Jeremy Ben Ami, is a major supporter of the Iran nuclear deal, engages in anti-Israel activism and partnerships on U.S. college campuses, and collaborates with leading Islamist and other anti-Israel groups in the U.S. to host conferences and other events that espouse virulently anti-Israel rhetoric.
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You can find the dossier here.