Spiral of silence theory describes the process by which one opinion becomes dominant as those who perceive their opinion to be in the minority do not speak up because society threatens individuals with fear of isolation.
The ‘Spiral of Silence’ Theory Explains Why People Don’t Speak Up on Things That Matter
I think that it's not only important, but interesting, to note that Elisabeth Noelle-Neumann, creator of the Spiral of Silence Theory, actually worked for Nazi newspapers during WWII. In 1940 she worked for Nazi newspaper "Das Reich," under Joseph Goebbels, later working for "Frankfurter Zeitung." Noelle-Neumann claims she worked from the inside, but her direct association with Spiral of Silence is intriguing.