sentences:  A.D. Club
  
  The A.D. Club is a final club established at Harvard University in 1836, the continuation of a chapter of the Alpha Delta Phi fraternity existing as an honorary chapter until 1846, and then as a regular chapter until the late 1850s.At that time, owing to the prevailing sentiment against such societies, it became a strictly secret society, known among its members as the "Haidee," the name of a college boat.