Control of language and ideas is a critical part of cultural hegemony:

In Marxist philosophy, cultural hegemony is the domination of a culturally diverse society by the ruling class, who manipulate the culture of that society (the beliefs, explanations, perceptions, values, and mores) so that their imposed, ruling-class world view becomes the accepted cultural norm; the universally valid dominant ideology, which justifies the social, political, and economic status quo as natural and inevitable, perpetual and beneficial for everyone, rather than as artificial social constructs that benefit only the ruling class.

If you live in the USA, you’ve probably already seen this a dozen times in your lifetime: Anti-unionism becomes “Right to work”, colonized peoples become “terrorists”, social support becomes “Welfare mothers”, immigrants become “illegal aliens”, petit bourgeiosie and the working class gets confused into “middle class”.

You can call these campaigns to miseducate conspiracies if you like, but they enter the public lexicon via mass inundation from capitalist media and educational institutions.