Mary "Mae" Foley (1886-1967) shattered gender barriers within the NYPD, becoming one of its first female plainclothes detectives. Her pioneering work inspired over 2,000 women to join the force. She served from 1923 to 1945.

Born in Manhattan's Lower East Side Gas House District to Irish and French immigrant parents, Mary Foley always aspired to a police career, even after marrying young and having children. As an adult, she resided at 30-16 82nd Street in Jackson Heights, Queens.

Foley began her NYPD training in 1923 and joined the "Masher Squad," a unit dedicated to protecting women from predatory men. She was later assigned to detective work under Chief Inspector William Leahy, actively participating in raids with the Volstead Act enforcement squad (also known as the Bureau of Prohibition or Prohibition Unit). From 1925 to 1930, she was assigned to the 19th Precinct in Manhattan. In 1930, she transferred to the 108th Precinct in Queens, where she became a detective in the homicide division.

During her career, Foley worked with Manhattan District Attorney Thomas Dewey, playing a crucial role in the successful conviction of Italian-born gangster Charles "Lucky" Luciano and exposing the pro-Nazi organization, the German American Bund.

Foley also contributed to the war effort by helping to organize the Women's Volunteer Police Reserves during World War I, serving as its captain.

Her legacy is documented in the book The Girls Who Fought Crime: The Untold True Story of the Country's First Female Investigator and Her Crime Fighting Squad by Mari Eder.

In 2024, a street was named "Det. Mary "Mae" Foley Way" in her honor, due to its proximity to the former site of the NYPD's 108th Precinct.