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

Crossword clues for Mr. Hoover. 5 letters:

EDGAR: Mr. Hoover.
GMAN: Investigator for Mr. Hoover.
GMAN: He works for Mr. Hoover.
ENGINEER: Mr. Hoover from 1895 to 1914.