the departed. they are known for being impossible to recognize on the streets. almost always operating in their own criminal underworld until now. translator: i explained that i just got off work, i m still wearing your work shoes, i m not your are target. i asked them not to beat me, but they didn t listen. reporter: calvin is a restaurant worker who says he doesn t take part in political protests. but the scars on his back tell of the savage beating he took as the pole wielding men targeted a train station last weekend. he was one of 45 people hospitalized as pro democracy activists were caught up in the violence. hong kong police have arrested 11 men and linked some to triad gangs. wherever the money, they will go. and whoever pay them, they will take the job.