Michael German is a fellow with the Brennan Center for Justice’s Liberty & National Security Program and a former FBI agent who infiltrated neo-Nazi terrorist groups as an undercover agent. Media contact is Mireya Navarro.

Amy Cooter, a sociology lecturer at Vanderbilt University, researches nationalism.

Mark Bray, a history lecturer at Rutgers University, is the author of “Antifa: The Anti-Fascist Handbook.”

Ruth Ben-Ghiat is a history and Italian studies professor at New York University. She studies fascism and her upcoming book is “Strongmen: From Mussolini to the Present.”

Kathleen Belew, a history professor at the University of Chicago, is the author of “Bring the War Home: The White Power Movement and Paramilitary America.”

Nancy L. Rosenblum is a professor of ethics in politics and government at Harvard University. She co-authored the book A Lot of People Are Saying: The New Conspiracism and the Assault on Democracy.

Brendan Nyhan is a government professor at Dartmouth College. His areas of study include fake news, fact checks and digital media literacy.

Alex Newhouse is a researcher at Middlebury College’s Center on Terrorism, Extremism and Counterterrorism, where he looks at right-wing and online extremism as well as religious fundamentalism.