Rios is shown on the video throwing Ronnie Holloway against the hood of his police car and flinging the 49-year-old to the ground.
Rios and fellow officer Erica Rivera have been suspended.
A few hundred people met with Mayor Alex Blanco Tuesday night and demanded that Rios be prosecuted.
The incident is under investigation by the Passaic County Prosecutor's Office.
Anthony Iacullo, an attorney representing Rios, says unpublished parts of the video show Holloway threatening Rios.
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