His experience of this total war profoundly affected MacLeod, leading him to train for the ministry. He studied divinity at the
University of Edinburgh, followed by a year at
Union Theological Seminary, New York City (1921-1922). Upon return to Scotland he was invited to become Assistant at
St Giles' Cathedral. During this period he became increasingly concerned over the issue of social inequality in Scotland. In 1924 he was ordained as a
Church of Scotland minister, to be Padre of
Toc H (Talbot House) in Scotland. Such non-parochial appointments were extremely unusual at the time. Following a disagreement, he resigned from Toc H in 1926, but was invited to become associate minister at
St Cuthbert's Church, Edinburgh. His wartime experiences, combined with a profound disillusionment by post-World War I political rhetoric of "a land fit for heroes," deeply affected him. Confronted by the realities of the
depression and unemployment faced by those less privileged than he, MacLeod gradually moved towards supporting
socialism and
pacifism. From 1937 he became actively involved with the
Peace Pledge Union (PPU), and from 1958 with the
Campaign for Nuclear Disarmament (CND). Meanwhile, in 1930, to considerable surprise, he decided to leave St Cuthbert's Church to become minister at
Govan Old Parish Church—encountering the considerable social problems caused by poverty in this part of Glasgow. The pace of work took its toll and in 1932 he suffered a
breakdown. He spent some time recuperating in
Jerusalem in early 1933. While worshipping in an
Eastern Orthodox Church on
Easter Day he felt a profound spiritual experience, feeling a sense of recovery of the Church as the corporate
Body of Christ. This would strongly influence the rest of his life. He resigned (giving up the financial security of a
parish minister's
stipend) to become the full-time leader of the
Iona Community, which he founded in 1938. His efforts started in the early 1930s when he bought Fingleton Mill as a refuge for Glasgow's poor. The idea of rebuilding
Iona Abbey using ministers, students and unemployed labourers working together influenced his thinking; the Iona Community developed as an international
ecumenical community, with offices in
Govan and a presence on the island of
Iona. Underpinning the fellowship of the Community were four emphases: mission, political involvement, a ministry of healing, and worship, by which MacLeod and the Community sought a way to connect the Church with an industrial age. He led a series of parish missions (sometimes known as a 'Message of Friendship') in Scottish parishes associated with the Community, and supported the 1950 Glasgow Churches' Campaign and the 1950s
Tell Scotland Movement. However, he opposed the invitation promoted by Rev.
Tom Allan to Dr
Billy Graham that led to the 1955 All-Scotland Crusade. == Global policy ==