1984 why do you suppose orwell mentions the names of people with whom winston works with and gives details of their jobs

The reader might get this information about the workers because this isa way of portraying who was responsible of the decisions making due to they were not random people. It might be added that most of them have a very important significance and relevance for example; Syme is in charge of the philosophical aspect of newspeak, later on, he would be an example of vaporization. An other example might be Parsons who seems to be the ideal citizen but he is under The Party´s control.

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