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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for 1947's ___-Hartley Act 4 letters:

NLRB: Org. affected by the Taft-Hartley Act of 1947
TAFT: 1947's ___-Hartley Act
ANTILABOR: Like 1947's Taft-Hartley Act