Eric Holder calls for calm ahead of Ferguson decision November 21, 2014 -- Updated 1903 GMT (0303 HKT) (CNN) -- Attorney General Eric Holder released a video message Friday, announcing new guidance for police when they respond to demonstrations and calling for protesters to act in a peaceful manner. His comments come as a grand jury is expected to make a decision in the case involving a police officer in Ferguson, Missouri and the shooting death of an unarmed black teenager in August -- an event that resulted in violent clashes between protesters and police. Ferguson officer Darren Wilson in talks to resign; grand jury decision nears "History has also shown us that the most successful and enduring movements for change are those that adhere to non-aggression and nonviolence," Holder said in the video. And so I ask all those who seek to lend their voice to important causes and discussions, and who seek to elevate these vital conversations, to do so in a way that respects the gravity of their subject matter. Holder said the new guidelines compile "information, tools, and best practices that will help law enforcement officers maintain public safety while safeguarding constitutional rights."