NYPD Intelligence Division Det. Wojciech Braszczok is arrested while undercover during a political demonstration in Grand Central (Danielle Kelly / Gothamist )

After an off-duty undercover police officer was arrested Tuesday for his involvement in the highly publicized motorcycle gang assault on an SUV driver, sources told NBC he had also spied on Occupy Wall Street as a member of the NYPD Intelligence Division. Now members of the movement remember "Albert," or more accurately, Detective Wojciech Braszczok, as a quiet, omnipresent demonstrator who would show up at your birthday party, sleep on the street, and get arrested at a demonstration.

Braszczok's arrest on the job came during a demonstration at Grand Central Terminal on August 17, 2012. Photographer Danielle Kelly accompanied a group of 30 or 40 people, some of whom were affiliated with Occupy, who marched from Bryant Park to Grand Central to protest the Citizens United decision.

http://gothamist.com/2013/10/10/occupys_undercover_shady_ubiquitous.php