At first, the Meiji Government's spy operations against Christians were led by the Danjodai (Inspection Bureau) based on 'Rules for Espionages' (June, 1870), succeeded in July 1871 by the Inspection Division at the Seiin (the central state council in the early Meiji period), which was set up with the new birth of the Daijokan (Department of State) system.
明治政府によるキリスト教徒へのスパイ活動は当初は弾正台が「諜者規則」（1870年6月）に基づいて行い、翌年7月には新しい太政官制により正院内の監部課が引き継いだ。