The sergeant, Phillip Wong, is accused of punching a handcuffed man in custody and kneeling on the back of another.
The woman was slumped over onto a sidewalk.
One of the men was recognized by a former business associate who accused him of stealing nearly $500,000.
Police are investigating whether the same suspect is connected to the attacks.
The December 17th attack is being investigated as a hate crime.
Police said the attack was the man's seventh assault charge this year.
The attack was among three last week.
"I just felt embarrassed and angry and disgusted."
Police are searching for the man.
The incident happened last Friday at a subway station in Harlem.
The man punched the 23-year-old woman several times, according to police.
A video showed the shocking incident.
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