In 1942 when the U.S. became involved in [[World War II]] following the [[attack on Pearl Harbor]], Murray was the only member of Congress from his state to support Roosevelt's [[foreign policy]];<ref>FascinatingPolitics (February 23, 2020). [https://fascinatingpolitics.com/2020/02/23/the-political-evolution-of-the-states-mapped-part-v/ The Political Evolution of the States, Mapped Part V]. ''Mad Politics: The Bizarre, Fascinating, and Unknown of American Political History''. Retrieved August 2, 2021.</ref> his colleague Wheeler was a staunch [[non-interventionist]], along with Montana's elected U.S. representative [[Jeannette Rankin]], the only member of Congress to vote against U.S. entry into the war.
He Murray opposed the 1947 [[Taft-Hartley Act]],<ref name=archives/> voting against Senate passage<ref>[https://www.govtrack.us/congress/votes/80-1947/s56 S 1126. PASSAGE.]. ''GovTrack.us''. Retrieved August 2, 2021.</ref> as well as overriding President [[Harry S. Truman]]'s veto of the bill.<ref>[https://www.govtrack.us/congress/votes/80-1947/s86 HR 3020. PASSAGE OVER THE PRESIDENT'S VETO.]. ''GovTrack.us''. Retrieved August 2, 2021.</ref>
In an address at Tiber Dam, Montana in late September 1952, President Truman praised Murray and his Democrat senatorial colleague [[Mike Mansfield|Michael Joseph "Mike" Mansfield]].<ref>[https://www.trumanlibrary.gov/library/public-papers/269/address-tiber-dam-montana Address at Tiber Dam, Montana]. ''Harry S. Truman Presidential Library and Museum''. Retrieved August 2, 2021.</ref>