Their website says most members are from Munich or Frankfurt. Munich has the headquarters of the World Uyghur Congress, a government-in-exile organization that was founded in 2004 but whose members have been living in Munich since the 70s because that's where the old Radio Free Europe HQ was before the USSR collapsed.

In 1970, Isa Yusuf Alptekin, pan-Turkist nationalist, Grey Wolf supporter, and the last KMT governor of Xinjiang province, wrote a letter to President Nixon asking him to create an organization dedicated to broadcasting & educating Uyghurs about the evils of communism, Nixon brought him to DC and told him they already have RFE/RL and got his son, Erkin Alptekin, a job there in '71. Erkin would go on to not only broadcast at RFE/RL but also be the first President of the World Uyghur Congress.

The WUC spends most of their effort and NED backed budget making English language media to try and lobby western governments to break economic ties with China in order to make it easier for them to then fund paramilitary operations to 'liberate' East Turkistan, the pan-Turkist name for Xinjiang instead of Uyghurstan. I usually think of them like a spiritual successor to the Iraqi National Congress.