Organic Act of the Mainland Affairs Council of the Executive Yuan Article 2

The Council shall have the responsibility to direct and supervise the provincial and city governments in their implementation of matters within the jurisdiction of the Council.
中文原文 行政院大陸委員會組織條例第2條
本會對於省(市)政府執行本會主管事務,有指示、監督之責。

English translation for reference only; the Chinese text prevails. Not legal advice.