German Democracy or Tyranny in Disguise?

Germany's domestic intelligence labeled Alternative for Germany (AfD) as a "right-wing extremist" group, sparking debates on democracy and authoritarianism. AfD, a rising nationalist party, won 20.8% in the recent election. This move grants the government powers to surveil and possibly ban the party. Critics like @marcorubio denounce this as tyranny masquerading as democracy. Modern Western leaders invoke democracy to justify their actions, but their true motives remain in question. Who defines "extremism," and are such measures truly democratic, or merely suppressing dissent? I ponder if true democracy exists in today's Western world.