CINA has pulled out of the vaults an old video of a Christmas 2003 action by the then ETU (MTU's predecessor) during a period of crackdown. When has there not been a period of crackdown? It seems that only its intensity seems to change. Anyways, if you have a sharp eye you can spot many of the migrant labour movements current and former activists about, most of whom have been forcibly deported over the years.
Here's the link.