Final answer:
The Anabaptists were the Protestant group that often antagonized secular authorities by refusing to recognize their jurisdiction and engaging in activities such as refusing to take oaths, serve in the military, or pay taxes.
Step-by-step explanation:
The Protestant group being referred to in the question is Anabaptists. Anabaptists were known for their refusal to recognize secular authorities and their rejection of their jurisdiction. They would often refuse to take oaths, serve in the military, or pay taxes. Anabaptists believed in the separation of church and state and advocated for pacifism. Their refusal to conform to the expectations of secular rulers made them widely feared and subject to violent attacks.