Margaret and her husband Alfred, both Quakers, later introduced Harold to the spiritual movement Subud, which had a profound effect on his life and work.
Pak Subuh accepted the invitation and visited the home of John G. Bennett in Coombe Springs.
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The Lancet medical journal in 1961-62 published four letters on apparent states of psychological crisis associated with Subud membership.
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The broadest organizational responsibility rests with the World Subud Association, which organizes a World Congress every four years and consists of the Subud World Council, Subud representatives from each country, and individual members who wish to participate, although only representatives can vote.
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In addition to the above affiliates, a foundation – the Muhammad Subuh Foundation (MSF) – has been set up, whose main work is helping groups acquire their own latihan premises.
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(Throughout Muhammad Subuh's book "Susila Budhi Dharma", which was written in 1952, testing is always referred to as "feeling" or "receiving". The first time "testing" was called by that name was in 1957 by John G. Bennett.)
The basis of Subud is a spiritual exercise commonly referred to as the latihan kejiwaan, which was said by Muhammad Subuh to be guidance from "the Power of God" or "the Great Life Force".