The U.S. Government asks Maris to intervene on behalf of a murder suspect who is working on a top secret project. The project is so top secret, the man can't give Maris any information that could help clear him. Season 2, Episode 9 (1960)
You can stream Lock Up: Top Secret free and legally on alltube, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.