The Radical Reformation was the response to what was believed to be the corruption in both the Roman Catholic Church and the expanding Magisterial Protestant movement led by Martin Luther and many others. Beginning in Germany and Switzerland in the 16th century, the Radical Reformation gave birth to many radical Protestant groups throughout Europe. The term covers both radical reformers like Thomas Müntzer, Andreas Karlstadt, groups like the Zwickau prophets and Anabaptist groups like the Hutterites and Mennonites.