Crossword clues for Largest union in the U.S. 3 lettersAnswerClueNEAU.S.' largest unionAFTSecond-largest U.S. teachers unionNEALargest U.S. labor unionNEAU.S.'s largest union, with 3.2 million membersNEALargest U.S. labor union: Abbr.NEAU.S.'s largest labor union, in briefNEAU.S.'s largest labor unionNEALargest union in the U.S.NEALargest labor union in the U.S.NEALargest labor union in the U.S.: Abbr.NEALargest labor union in the U.S., in briefAFLCIOLargest U.S. union org.AFLCIOThe U.S.'s largest union groupAFLCIOLargest U.S. federation of unionsAFLCIOU.S.'s largest alliance of trade unions