The alleged reason for the police harassment was that he fell asleep on the train.
In the video we can hear the man plea with police to allow him to stay on the train so he can get home. He was on his way home from work, according to the video.
The situation quickly escalates to violence and several officers begin beating the man with batons.
Finally 2 large NYPD cops rush onto the train and take this otherwise peaceful man down.