In Arkansas Educational Television Commission v. Forbes (1998), the Supreme
Court upheld a decision to exclude Ralph P. Forbes, an independent
candidate for Congress, from a televised debate. The ruling overturned a
ruling that AETC had created a public forum to which all candidates should
have access.

Frisby v. Schultz (1988) upheld a city ordinance banning picketing in
neighborhoods. Dissenting justices said the law suppressed First
Amendment-protected speech.

In Manhattan Community Access Corporation v. Halleck (2019), a sharply
divided U.S. Supreme Court ruled that a private corporation that oversees
public access channels in Manhattan is not a state, or governmental actor,
subject to First Amendment constraints. The Court determined that
“operation of public access channels on a cable system is not a traditional
exclusive public forum.”

In McCullen v. Coakley (2014) the Court ruled that a state law prohibiting
individuals from standing in a buffer zone outside an abortion facility
violated the First Amendment.

Nurre v. Whitehead (2010) involved a student, who alleged her First
Amendment rights were violated when the band could not perform a religious
instrumental at graduation.

Pleasant Grove v. Summum (2009) determined a city could refuse to place a
monument in a public park because it was a form of government speech immune
from First Amendment review.

In 1983, the Supreme Court ruled that a federal law that prohibited
picketing outside the U.S. Supreme Court building was improperly applied to
the sidewalks in violation of the First Amendment’s protection of free
speech. In United States v. Grace, the Court said sidewalks are traditional
public forums.

In 1990, the Supreme Court upheld a federal regulation that prohibited
solicitation on post office property, including the sidewalks outside. In
United States v. Kokinda, the Court in a 5-4 decision narrowly sided with
the government in the face of a First Amendment challenge.

Widmar v. Vincent (1981) said that prohibiting religious use of the
University of Missouri’s buildings while allowing secular use violated the
First Amendment.