In what 1925 Supreme Court case did the American Civil Liberties Union argue that the First Amendment protects free speech even when such speech "directly advocates the unlawful overthrowing of the government"?

The 1925 Supreme Court case in which the American Civil Liberties Union argued that the First Amendment protects free speech was the 'Gitlow versus the state of New York case'.

Explanation:

The Supreme Court ruling in this case expanded the scope of the first amendment considerably by establishing a standard applicable to both the state and the federal government to cease them from criminalizing the speech or writing done against them. The case was surfaced as a result of the conviction under the New York state law of bad tendency test against Benjamin Gitlow for his attempt to publish the left-wing manifesto in the year 1919.

Gitlow v. New York