A Winthrop man pleaded not guilty to disorderly conduct and resisting arrest charges Monday as prosecutors alleged he was among a group of more than 100 people seen riding bicycles, dirt bikes, and motorized scooters through Boston over the weekend.

Adam Harrison, 22, was released on personal recognizance following his appearance in the Boston Municipal Court’s South Boston Division. Court records indicate a defense attorney wasn’t available for his arraignment due to the bar advocate work stoppage .

State Police previously said Saturday’s unauthorized parade began around 2 p.m., when a mass of bikers rode over the Zakim Bridge and into the O’Neill Tunnel on Interstate 93 south. The trooper who arrested Harrison was swarmed by motorcyclists and bicyclists when he attempted to block a

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