After David Cicarella gained trust with the teachers, he was able to use a power tactic this chapter calls legitimate power to persuade the teachers to de-emphasize minor grievances.
This is the type of power that is regarded as a formal type of power. This is the power that a person would get legitimately and formally within a group that they are to lead. The legitimate powers are very different from the dictatorial power which would be done by the use of force.
The question tells us that he was able to gain the trust of the teachers. This tells us that most of the teachers voted for him to have this power to lead them.
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