The Collaborative International Dictionary of English v.0.48:

Harmonist \Har"mo*nist\, Harmonite \Har"mo*nite\ (-n[imac]t), n.
   (Eccl. Hist.)
   One of a religious sect, founded in W["u]rtemburg in the last
   century, composed of followers of George Rapp, a weaver. They
   had all their property in common. In 1803, a portion of this
   sect settled in Pennsylvania and called the village thus
   established, Harmony.
   [1913 Webster]