Matt Sharp, counsel with Alliance Defending Freedom, tells schools that try to target Chick-Fil-A to halt serving on their campuses from pressure of homosexual groups better think twice. He states that federal law prohibits that type of action and the schools might face fines and penalties if they should so try to prohibit businesses from doing that threat.
“So, I think that’s a terrible example, in addition to violating the law, for these universities to say Chick-fil-A, your viewpoint’s not welcome here on campus, because we don’t agree with your particular view on the definition of marriage, the biblical definition of marriage,”
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It's not unlawful. Nothing suggests that when a contract is up for renewal that a customer e.g. a college board of trustees has to give any reason why one competitor is chosen over another. There is no such thing as a corporations 'right to set up camp'.