Brewster came to national attention due to his opposition to the commercial interests of
Howard Hughes, America's wealthiest person at the time. In 1947, Brewster was chairman of the
special Senate committee investigating defense procurement during
World War II. He claimed concern that Hughes had received $40 million from the
War Department without actually delivering the aircraft he had contracted to provide, but Hughes countered that Brewster was motivated by his connections to
Pan-American Airways, the rival to Hughes's
Trans World Airlines. Hughes aggressively combatted the inquiring Brewster, alleging that the senator was corrupt. Memoirs by Hughes's right-hand man
Noah Dietrich and syndicated newspaper columnist
Jack Anderson each sketched Brewster as, in Dietrich's words, "an errand boy for
Juan Trippe and
Pan American World Airways," who pushed for legislation that would give Pan Am the single-carrier international air
monopoly for the U.S. The
Martin Scorsese movie
The Aviator portrays Brewster (played by
Alan Alda) similarly, as corrupt and in the pocket of Pan Am, the rival of Hughes'
TWA. Hughes spread rumors about Brewster's close association with Pan Am, alleging that he received free flights and hospitality in return for legislation such as his bill to withdraw government approval for TWA flights across the Atlantic. In a Senate hearing that electrified the nation, Hughes repeated his accusations that Brewster had promised an end to the Senate inquiry if Hughes would agree to merging TWA with Pan Am. (Dietrich wrote that Hughes, in a bid to stall for time before the hearing, went so far as to launch negotiations with Trippe about such a merger.) In response, Brewster, stung by the allegations, stood aside from chairing the inquiry and became instead a witness before the committee – which also allowed Hughes to question Brewster directly. Brewster denied Hughes' allegations and made several counter-claims, but by the time the hearing ended Brewster's reputation had suffered greatly. Ironically, Hughes, for all his wealth, came across as what Dietrich described as the "little guy" who "fought City Hall and won." In 1952, Hughes worked hard to ensure Brewster's political demise, persuading the then-Governor of Maine,
Frederick G. Payne, to challenge him in the Republican primary. Armed with $60,000 of campaign funds from Hughes, Payne challenged Brewster. Payne proceeded to connect Brewster with
McCarthyism and
racist groups and also took up Hughes' claims that Brewster was corrupt. This led to the unusual defeat of an incumbent Senator in his own
primary. Brewster resigned his seat in December 1952 and was succeeded by Payne, who would only last one term, being defeated by
Edmund Muskie in 1958. ==Retirement and later years==