On June 2020 Wikipedia user RGloucester had recently removed mentions of Marxist scholar Trent Schroyer as being the origin of the term Cultural Marxism on his Wikipedia article.
This is censorship, and is likely being done to promote the regressive left's Cultural Marxism denialist conspiracy theory
This is the "right side of history." You control the narrative.
“Those who control the present, control the past and those who control the past control the future.” - George Orwell
If you have any older dictionaries, encyclopedias, documentaries, or things of historic value - keep them. When people stopped keeping permanent, and personal copies of things, it allowed others to control them.