First you terrorize your opponents into silence so that your movement appears to have no opposition. This gives you tremendous power, not only because moderates quietly feel they are alone in their disagreement with you, but also because the ignorant media especially the foreign media casts you as the choice of the people. Having succeeded in silencing moderates, the next step is terrorizing them into cooperating with you. Soon passive cooperation is not enough. You want more than their body you want their soul, so you terrorize the moderates into being "passionate" in your cause.
In the end, your movement appears to have only loyal and active supporters. Now you are in total control, for who would dare speak out against you? As Hitler said, 10 years before he finally rose to power, "The National Socialist Movement will in the future ruthlessly prevent if necessary by force all meetings or lectures that are likely to distract the minds of our fellow countrymen." In other words, all opposition is evil and we will protect you from it. Sound familiar? -- Source