In George Orwell's book, 1984, an event takes place every single day called the "Two Minutes Hate." The Inner Party, Oceania's ruling class, uses this as a tool to guide and disperse its subjects' agression and emotion. It also serves to demonize The Party's (largely contrived) enemy, Emmanuel Goldstein, and whatever country Oceania is currently (and always has been) at war with.
It is a series of images and audio of whoever The Party finds it convenient to make their enemy for the time being, combined with terrible screeching noises, and descriptions of their "heinous crimes," and finally ending with the face of the powerful Big Brother, and the three party slogans: War Is Peace, Freedom Is Slavery, Ignorance Is Strength. Once a year, the Two Minutes Hate is superseded by Hate Week, which is an elaborate extension to the Two Minutes Hate, featuring banners, parades, and speeches.
All this is in an attempt to condition the Outer Party members into knowing that Goldstein is their enemy, and Big Brother is their saviour.