<blockquote>Adults were a different proposition. Some adults clearly supported Hitler - as the March 1933 election showed. But the same election clearly showed that a substantial number of Germans did not support Hitler and the Nazis. These people were likely to be a constant thorn for Hitler unless they were dealt with. For these people, the Nazis developed a policy of intimidation. Fear became a by-word for those who did not support Hitler. The wrong comment overheard by a Nazi official could have very serious consequences.

Hitler’s police state worked on the rule that if you said nothing, no harm, could come to you. If you had doubts about the way the country was going, you kept them to yourself - or paid the price. As nearly 17 million people had not voted for either the Nazis or the Nationalist in March 1933, a large and visible police force was required to keep this sizeable group under observation and control.</blockquote>
via <a href="http://www.historylearningsite.co.uk/nazi_police_state.htm">The Nazi Police State</a>.