Psychologists Act Article 51

The national union of clinical psychologist guilds or counseling psychologist guilds shall be founded and organized only after at least 1/3 of municipal and county (city) clinical psychologist guilds or counseling psychologist guilds have been established.
中文原文 心理師法第51條
臨床心理師公會或諮商心理師公會全國聯合會之設立,應由各三分之一以上之直轄市、縣(市)臨床心理師公會、諮商心理師公會完成組織後,始得發起組織。

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