My favorite was the 1957 film with Henry Fonda,Lee J.Cobb,Martin Balsam,E.G.Marshall ,Jack Klugman,Jack Warden ,Edward Binns and John Fiedler,all great, called "12 Angry Men".Another good one (but not as good as Harper Lee's 1960 novel)was 1962's "To Kill a Mockingbird",with Gregory Peck and Mary Badham.What are yours?

Inherit The Wind (1960) A science teacher is put on trial for teaching evolution.

My favorite was the 1957 film with Henry Fonda,Lee J.Cobb,Martin Balsam,E.G.Marshall ,Jack Klugman,Jack Warden ,Edward Binns and John Fiedler,all great, called "12 Angry Men".Another good one (but not as good as Harper Lee's 1960 novel)was 1962's "To Kill a Mockingbird",with Gregory Peck and Mary Badham.What are yours?

Those 2 are excellent, also-

Judgment at Nuremberg- Four Nazi judges are tried for war crimes. Spencer Tracy, Burt Lancaster, Richard Widmark, Maximilian Schell, Werner Klemperer, Marlene Dietrich, Judy Garland, William Shatner and Montgomery Clift.

Witness for the Prosecution (1957), with Tyrone Power, Charles Laughton and Marlene Dietrich. Two films directed by Otto Preminger, Anatomy of a Murder (1959), with Jimmy Stewart, Lee Remick and George C. Scott and Advise & Consent (1962), starring Henry Fonda, Peter Lawford and Gene Tierney. All great films!

All the above, but "12 Angry Men" foremost, plus - while not great, but very good - "The Rack" (1956) with Paul Newman, Walter Pidgeon, Anne Francis,
and Lee Marvin.