Joseph, also known as Abdullah Ali Yusuf, was arrested after taking possession of two semi-automatic rifles in December, authorities said. Investigators became aware of Joseph after they noticed pictures of knives and firearms on his social media accounts, court records show. FBI agents posing as members of ISIS began a monthslong conversation with Joseph in which he offered his services in creating propaganda videos, officials said. In September, agents asked Joseph whether he hated people in America. “Oh yeah, definitely,” answered Joseph, according to court records. “The gays the Christians the Catholics the Jews you name it.” Undercover agents later...