Municipal Organization Act of 1884
The Loi du 5 avril 1884 sur l'organisation municipale (English: Law of 5 April 1884 on Municipal Organization) is a foundational law of the French Republic. It established the framework for the operation of French communes, marking a significant step toward decentralization in France.
Source: Wikipedia — Municipal Organization Act of 1884 (CC BY-SA 4.0)