Class societies are fraternal organizations that recruit only from the one class each year. Historically, these types of organizations thrived between 1850 and 1930, although many still exist. Most are either Senior Socieites or Sophomore Societies. Originally highly secretive organizations, on many campuses, these organizations have become primarily honor societies, although they still maintain many of the traditions of the original societies. Unlike other collegiate fraternal organizations, class societies do not use Greek letters for their names.