Abstract
The Secret Survey Concerning the Missionary Work of the Roman Catholic Church in Finland 1959–1960 — Fifty years ago, at the same time as Pope John XXIII announced the convening of the Second Vatican Council, the Bishops’ Conference of the Evangelical Lutheran Church of Finland commissioned a study on the missionary work of the Roman Catholic Church in Finland. The study was intended to be kept confidential. The increased activity of the Catholic Church worried many of the leading figures of the Lutheran Church. The potential influence of the Catholic Church on Lutheran children was regarded as particularly threatening.