Its official title is a Franco-German compound Confédération Compagnonnages Européens/Europäische Gesellenzünfte, abbreviated as CCEG.
[1] The few information on their website has automated translations to English and Danish.
In general the membership in an association is not limited to nationality but a working knowledge of the language is required along with a completed apprenticeship in a profession.
Only those associations have survived from the middle ages that support professions required on construction sites.
For example the Rolandsschacht union requires an aspirant to be male, below the age of 27, and with a profession as carpenter, bricklayer, stonemason, joiner, roofer, slater, paver, carver or concrete worker.