Thurgood Marshall, Amalgamated Food Employees Union…
“ We do not hold that respondents, and at their behest the State, are without power to make reasonable regulations governing the exercise of First Amendment rights on their property. Certainly their rights to make such regulations are at the very least co-extensive with the powers possessed by States and municipalities, and recognized in many opinions of this Court, to control the use of public property. Thus where property is not ordinarily open to the public, this Court has held that access to it for the purpose of exercising First Amendment rights may be denied altogether. ”
