The Irrawaddy has an artilce about Padaung people here.
Padaung is an ethnic minority living along the Thai-Burma border. They are known as "long-necks" by the outside world. Because of their unique cultural practice of neck-stretching, they attract interest from all over the world. It's a beauty to be unique in the world. However, it's a curse to be regarded as "objects" for tourist attractions.
Here are some excerpts from the article.
The three camps [in Thailand] where Padaung live are called "human zoos" by critics.
In 1998 Thai police raided a Padaung village in Chiang Mai Province and charged the businessmen who ran the tourist attraction with holding the villagers against their will.