REALITY CONTROL - control through surveillance (telescreens/thought police), terror (torture, imprisonment, vaporization, spying by neighbours/coworkers/family), and propaganda/mind control (telescreens, destruction of historical evidence, rewriting facts, newspeak).
SEX, LOVE AND LOYALTY - Love and romantic feelings forbidden; Big brother requires worship; sexual frustration can be controlled and used for war fever/leader worship)
CLASS STRUGGLE (COMPETING SOCIAL GROUPS; MARXISM HIGH/MIDDLE/LOW) - Winston reads Goldstein's book on class struggle; Inner Party / Outer Party / proles