Lieutenant Monroe Fein (1923–1982) was a U.S. Naval Officer and decorated veteran of the Pacific campaign of World War II. Later on, he was the captain of the ill-fated Altalena on behalf of the Irgun at the beginning of the 1948 Arab-Israeli War.
Monroe Fein was born in Chicago to a middle-class Jewish family in 1923. His father was a lawyer and a donor to Zionist causes. As a child, he excelled in sports such as swimming, running, and boxing.
When Fein entered university, he made good use his physical abilities in encounters with antisemites. Following the outbreak of World War II, Fein cut short his studies and enlisted in the United States Navy. He reached the rank of Lieutenant and was appointed commander of a transport ship His ship saw action in the Pacific, participating in the Marshall Islands campaign. He later served on an aircraft carrier that participated in raids on Japan.
Following the end of the war, Fein was discharged from the US Navy in 1946. He returned to Chicago and found work as the office manager of a publishing house in Chicago.
In Chicago, Fein quit his job and volunteered to help the Zionist cause. He met Irgun representative Avraham Stavsky, and was appointed captain of the Altalena on behalf of the Irgun from its departure point in Port-de-Bouc, France to the newly formed state of Israel in June 1948. Upon arriving in Israel the ship was shelled causing incredible controversy and antagonism between Israeli military and paramilitary groups. After the shelling of the Altalena many members of the Irgun were arrested, including Captain Fein. The shelling, controversy and political fallout that came from the fight are collectively known as the Altalena Affair.