Who did the Catholics and Protestants consider to be dangerous radicals?

Anabaptists were part of the radical reform movement in 16th century Europe. Hutterites, Amish and Mennonites are direct descendants of the Anabaptists. They required baptismal candidates to make their own faith confessions, and as a result forbade the baptism of infants. They were persecuted by both the Roman Catholics and the Magisterial Protestants.