Just a note: the OR book that I quoted in my comment above was Organization for Kingdom-Preaching and Disciple-Making, which was issued in 1972, and was the precursor to Organized to Accomplish Our Ministry
From Organized to Accomplish Our Ministry:
DISASSOCIATION
The term
disassociation applies to the action takenen by a person who,
although being a baptized member of the congregation, deliberately repudiates Christian standing, rejecting the congregation and stating that he no longer wants to be recognized or known as one of Jehovah's Witnesses. As a
disassociated person, his situation before Jehovah is far different from that of an
inactive Christian having grown weak spiritually, no longer shares the field ministry. Such an
inactive person may have failed to study God's Word regularly, or his zeal serving for Jehovah may have cooled off due to experiencing personal problems or persection (1 Cor. 11:30; Rom. 14:1) The elders, as well as other concerned members of the congregation will continue rendering appropriate spiritual assistance to the
inactive brother. (I Thess. 5:14; Rom. 15:1; Heb. 12:12) However, the person who has
disassociated himself by repudiating the faith and deliberately abandoning Jehovah's worship is viewed in the same way as one who has been disfellowshipped. A brief announcement would be made to inform the congregation that the person has voluntarily disassociated himself from the congregation. Concerning those who renounced their Christian faith in his day, the apostle John wrote: "They went out from us, but they were not of our sort; for if they had been of our sort, they would have remained with us." (1 John 2:19) Also, a person might renounce his place in the Christian congregation by his actions, such as by becoming part of a secular organization the objective of which is contrary to the Bible and, hence, is under judgment by Jehovah God. (Compare Revelation 19:17-21; Isaiah 2:4.) So if a person who is a Christian chooses to join those who are disapproved by God, it would be fitting for the congregation to acknowledge by a brief announcement that he has disassociated himself and is no longer one of Jehovah's Witnesses. Such a person would be viewed in the same way as a disfellowshipped person.