"Behind the Green Lights," published in 1931, describes Willemse's rise from patrolman in the mainly
Irish-American NYPD, to acting Captain in the
homicide squad. It describes his service in some of the roughest neighborhoods of the city at the time, including
Chinatown, the
Lower East Side and
Tenderloin. In that memoir and "A Cop Remembers," published in 1933, Willemse makes candid revelations of the often brutal police methods used at the time, as well as a rare law enforcement perspective on the
gangs of New York during the
Prohibition and pre-Prohibition era. His books, which were well received at the time and are now frequently quoted in historical literature, Willemse discusses at length his use of "third degree"
interrogation methods on prisoners. Willemse also describes his confrontations with major gang members of the early 20th Century, including
Kid Dropper,
Little Augie Orgen and Tom Flanagan. A highly fictionalized version of "Behind the Green Lights" was produced as a
motion picture by a small production company in 1935. == Quotes ==