The Shogunate was very careful about that, actively carried out intelligence gathering activities using spies, and when they feared impropriety or insurrection, did not hesitate to revoke rank.
それだけに幕府の警戒は強く、隠密による諜報活動を積極的に行い、不正や謀叛の恐れがある場合は、厳しく改易に処した。