Sauce: https://www.theguardian.com/commentisfree/2009/feb/10/tibet-...
This was just the first google result for 'dalai lama slaves' (no quotes). The West wants to think that Tibet is the the good guy, since China is _obviously_ the bad guy, but it turns out that history doesn't have good guys and bad guys; it has humans, and humans at the top of large-scale traditional hierarchies tend to be cruel to humans at the bottom of those hierarchies. So it goes.