Popular support for extremist parties is on the rise in liberal democracies today. In both new and well-established liberal democratic states, extremists are gaining government appointments and seats in legislative assemblies. As they gain power, they are better situated to enact their illiberal and antidemocratic goals into law and even alter their constitutions. The Fidesz Party of Hungary and the Law and Justice Party of Poland exemplify this trend. Both parties have used their democratic mandate to dismantle fundamental features of liberal constitutionalism and entrench their rule. Most recently, Fidesz stated it will use its supermajority in parliament to amend the constitution to read that “The protection of Hungary’s self-identity and its Christian culture is the duty of all state organizations”—threatening religious liberty and minorities’ rights. The Law and Justice Party just passed a law that enabled it to purge judges who are critical of the party from the courts, including the Supreme Court—undermining the balance of powers. Wherever extremists have gained control, they have adopted these sorts of tactics to realize their political goals. Broadly speaking, these tactics include weakening checks by the judiciary and administration on the legislative and executive branches by purging opposition judges and officials and replacing them with loyalists; consolidating power by altering election laws and amending the constitution to favor parliament and the executive; bullying and silencing the opposition within the legislature; weakening the rights that enable civil society to challenge and check the legislative and executive branches; and, finally, stoking racist, xenophobic, and anti-pluralist sentiments to mobilize their electoral base.