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]