How is power maintained by the collectivism in Anthem?

As in her other works, in Anthem Ayn Rand's central point is that people are duped into believing that self-interest is wrong and immoral and that this is how collectivist societies are perpetuated. Like other dystopian novels, Anthem is a projection into the future of events and movements that are already occurring in the real world of the author's own time. Rand was a young girl in Russia when the Bolshevik Revolution took place. In her view, the communists, even during their initial period of control under Lenin, were basically a gang of thugs who were interested only in power for themselves. The ideals about equality and a workers' state were a sham. (Interestingly, in Orwell's 1984 this is exactly what O'Brien reveals about the Party during Winston's "re-education": that the Party is interested solely in power for itself.) As the root of the problem, Rand identified traditional morality—both of religion and secular philosophy—that stressed the ideal of selflessness and of the individual's devotion, not to his or her own interest, but to that of other people (the "collective"). This "demonization" of self-interest, for Rand, was what enabled the creation of the Soviet collectivist society. In her view, the general twentieth-century trend of laissez-faire capitalism being weakened or destroyed would eventually lead to the dystopia predicted in Anthem.
Unlike in the famous anti-utopian prophecies of Huxley and Orwell, Rand shows a future society in a primitive state in which technology no longer exists. This is in keeping with her view that unrestricted capitalism is the only system that allows humanity to advance and to make scientific discoveries that will improve the world. Her one-time disciple Nathaniel Branden wrote an essay in which he theorized that the world of Orwell's 1984, with its telescreen that enables the surveillance of the entire population, is a logical impossibility. A socialist, collectivist world, in Rand's and Branden's view, would be too primitive for such technology to exist.
In all of Rand's writings, the basic idea, therefore, is that power-hungry, envious people have foisted upon others the false idea that the individual must sacrifice himself or herself for the good of others. This is how people are chained by collectivism in Anthem, until the point where her protagonist makes his famous discovery of the word "I."