In Adderly v. Florida (1966), the Supreme Court said stopping protestors
from blocking access to a jail did not suppress their First Amendment
freedoms.

Bell v. Maryland (1964) arose from the trespass convictions of civil rights
demonstrators who in 1960 held a “sit-in” to protest a restaurant’s policy
of racial segregation.

Brown v. Louisiana (1966) ruled that a sit-in demonstration protesting
segregation in a public library was protected symbolic speech under the
First Amendment.

In Food Lion, Inc. v. Capital Cities/ABC, Inc. the U.S. Court of Appeals for the 4th Circuit ruled that two undercover journalists who lied to obtain jobs at Food Lion and then videotaped unsafe food handling practices could be held liable for violating their duty of loyalty to their employer and for trespass but could

In Garner v. Louisiana, the court ruled that a Louisiana breach of the
peace law was too vague to be applied to the peaceful sit-ins used by civil
rights protestors.