What is the scope of First Amendment free speech protections in the context of "expressive association"?

The First Amendment's free speech protections encompass the freedom to engage in "expressive association," which protects a group's right to gather for a particular expressive purpose, such as a protest or parade. Hurley v. Irish-Am. Gay, 515 U.S. 557, 569 (1995); cf. Dallas v. Stanglin, 490 U.S. 19, 25 (1989) (explaining a group's coming together for a different associational purpose, like dancing, does not "involve the sort of expressive association that the First Amendment has been held to protect").

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