Administrative Procedure Act Article 23
Where the conduct of a procedure will affect the right or legal interest of a third person, the administrative authority may ex officio or upon application give such person a notice of intervention into the procedure as a party thereto.
中文原文 行政程序法第23條
因程序之進行將影響第三人之權利或法律上利益者，行政機關得依職權或依申請，通知其參加為當事人。