Two protesters face federal charges of attacking police officers during a demonstration over the suffocation death of Daniel Prude, prosecutors said Wednesday. Adam Green and Dallas Williams-Smothers, both 20, were charged with obstructing and impeding law enforcement during a civil disorder. Green struck an officer in the head Saturday night with a makeshift wooden shield after the crowd was told to disperse on Saturday and struggled with police after his arrest, authorities said. Dallas Williams-Smothers threw a "mortar-style, commercial-grade" firework at a line of uniformed Rochester police officers that same night, according to U.S. Attorney James P. Kennedy. "These arrests are not about deterring free speech, they're about deterring violent and dangerous criminal activity," Kennedy said at a news conference. It could not immediately be determined if Green and Williams-Smothers had lawyers. Kennedy said they were appearing in federal court Wednesday afternoon. Demonstrations have been held nightly in Rochester since videos were released last week of police restraining the naked Black man on the street in the early morning hours of March 23. Prude, 41, died March 30 after being taken off of life support. Kennedy said conviction on the charge can lead to up to five years in prison and a $250,000 fine. Police Chief La'Ron Singletary and three other leaders of the force suddenly announced Tuesday that they were retiring. Three others gave up top leadership positions and returned to lower ranks. Subscribe to our YouTube channel: https://bit.ly/2TwO8Gm QUICKTAKE ON SOCIAL: Follow QuickTake on Twitter: twitter.com/quicktake Like QuickTake on Facebook: facebook.com/quicktake Follow QuickTake on Instagram: instagram.com/quicktake Subscribe to our newsletter: https://bit.ly/2FJ0oQZ Email us at [email protected] QuickTake by Bloomberg is a global news network delivering up-to-the-minute analysis on the biggest news, trends and ideas for a new generation of leaders.