A union would need:

--clear purpose, goals and a charter, and active means to further them
--a website and other methods of promotion
--a strong membership base b
--accreditation standards for schools
--a source of income (doesn't need to be much)
--a strong board of directors (probably the founding members at first)
--regular meetings and forums (online or otherwise)
--support for members

I totally support a "China Foreign Teachers union" or something of that nature.

Extc - The ex-training centre teacher.