A crew of ruffians all decked out in black brutally attacked and robbed a man sleeping aboard a Manhattan subway train last week, police said.
Cops said the three fiends approached the 32-year-old victim while he was getting some shut-eye on a southbound 4 train near Union Square around 3:30 a.m. on Friday.
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One of the brutes then started wailing on the sleeping man – and after that jacked his cellphone, cops said.
The cowards then ran off into the wind, but not before trying to take the man’s watch, police said…