What is the morrison case by albert maltz about?

Albert Maltz wrote “The Morrison Case” where he used a fictitious character whose name is Pete Morrison and who is very curious by nature about everything, his curiosity also includes Communism for which he loses his job and is called Un-American, the play continues portraying his further problems. The Play was actually based on an original case held in Brooklyn Naval Yard. 

answer; (a) he was a u.s senator for 38 years;