Ingsoc's motto is 'Who controls the past controls the
future'.
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INGSOC represents , or is equivalent to , ENGlish SOCialism .
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English Socialism
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Ingsoc stands for "English Socialism," a political ideology featured in George Orwell's novel "1984." It represents the totalitarian regime's philosophy ruling Oceania. The Party uses Ingsoc to control its citizens, rewriting history and manipulating language to maintain authority and power.
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http:/enzperiodzwikipediazperiodzorg/wiki/Ingsoc
To properly understand I suggest you read the book which,
despite anything else, is an amazing read!