Terry Gross

Allison Silverman, the executive producer and head writer of The Colbert Report, discusses the show's recent broadcasts from the combat zone in Iraq.

Ta-Nehisi Coates' pays tribute to his father in his Memoir.

Chip Berlet has studied extremism, conspiracy theories and hate groups for more than 25 years. He says that the recent murders of abortion provider Dr. George Tiller and Holocaust Museum guard Stephen T. Johns exemplify the potential for violence that often lurks within extremist groups.