In George Orwell's 1984, the objective of the Party is quite simple: control. Though the Party seeks to achieve this goal in a number of ways, they are encompassed under two specific methods. The Party first manipulates the population's ability to express itself. In the Ministry of Truth, the news of current events is "rectified" so that a certain perspective - the perspective that presents Big Brother in the most appealing light - is the only view expressed. The population, not knowing anything different, does nothing to question what they hear or read. The use of Newspeak, the rather abbreviated language of the Party, prevents the people from expressing themselves freely. With a much smaller vocabulary, the creativity of language is stifled, as is any real ability to form a dissenting opinion against Big Brother. Not only does the Party control the knowledge the population takes in but also the way in which it can express itself.
The other form of control is a much more physical one. While Newspeak will eventually silence dissent by the process of eliminating problematic vocabulary, the Ministry of Love provides a much more immediate deterrent to dissent. Those caught by the Thought Police are taken to the Ministry of Love, where they are "re-educated," or "vaporized." In the latter case, the Party erases any evidence of a person's existence. In the first case, something Winston himself experiences, his mind is remolded in the pattern favored by the Party.
In both cases, the Party establishes its one goal - control. They control the thoughts of the population not only by psychological and epistemological means but also by physical ones.