It's based on amicus briefs that Michael Dorf (Cornell), Andrew Koppelman (Northwestern), and I filed in past cases (and that I blogged about before), but it elaborates somewhat further on that argument. There's still time to make changes, so I'd love to hear people's responses; you can also read it in PDF.
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Anti-BDS laws, which bar government contractors from boycotting Israel, are generally constitutional—for the same reason that anti-discrimination laws are generally constitutional: Refusals to deal are, outside some narrow situations, generally unprotected by the First Amendment.
