Three clear examples of control within the community in The Giver come to mind immediately. First, when children reach the age where they are about to finish their schooling and enter the workforce, they do not have the freedom to choose their paths themselves. Their futures are determined for them by the Elders of the community, who speak to their teachers and others in order to make a binding decision about the path the young adults will pursue.
Second, people are not free to love one another as they are in our society. In The Giver, when people reach the age of puberty, they begin to take daily pills to suppress their hormones and sexual desires. It would seem that there are no physically intimate relationships in the society, as children are bred by breeders that are inseminated and married couples are not responsible for reproduction or able to reproduce on their own.
Third, language is controlled in a very strict manner. Stringent adherence to language norms and rules are required, and any deviation is considered a violation of the rules. Even the slightest exaggeration is considered a violation, as language usage is controlled by established rules.
These are controls that govern how people behave. There are also controls beyond human behavior and interpersonal interaction. For example, in the society of The Giver, the weather is controlled to eliminate any variations. The climate is always temperate. In addition, colors are controlled or, more precisely, have been eliminated.