Final answer:
A governmental action that would be considered a violation of the First Amendment is prohibiting peaceful assembly.
Step-by-step explanation:
The First Amendment to the United States Constitution protects various rights, including freedom of speech, press, religion, and assembly. A governmental action that would be considered a violation of the First Amendment is prohibiting peaceful assembly. This means if the government restricts or prevents individuals from gathering together to express their opinions or protest peacefully, it would go against their First Amendment rights.