What is the name of Niccolò Machiavelli's work that argued effective leaders needed to crush their opponents at all costs?

The name of Niccolò Machiavelli's work that argued effective leaders needed to crush their opponents at all costs is "The Prince." In this influential political treatise, Machiavelli explores the tactics and strategies that a ruler should employ in order to maintain power and control. He emphasizes the necessity of manipulation, pragmatism, and even cruelty when dealing with adversaries and potential threats to one's rule. "The Prince" remains a seminal work in the field of political theory, offering a controversial perspective on leadership that has sparked debates and discussions for centuries.