 Data shows per-capita excommunication rates among the LDS Church have varied dramatically over the years, from a low of about 1 in 6,400 members in the early 1900s to one in 640 by the 1970s, an increase which has been speculatively attributed to "informal guidance from above" in enforcing the growing list of possible transgressions added to "Handbook" editions over time.Jehovah's Witnesses practice a form of excommunication, using the term "disfellowshipping", in cases where a member is believed to have unrepentantly committed one or more of several documented "serious sins".The practice is based on their interpretation of 1 Corinthians 5