For the past three days, the call has been the same from Washington D.C. for people across the nation and the globe to unite in the fight against violent extremism. More than 60 nations were represented, along with experts from across the U.S., including several from Boston. 

Robert Trestan, the New England regional director of the Anti-Defamation League, and Saidi Abdi, from the Refugee Trauma and Resilience Center at Boston Children’s Hospital, attended the summit.