Full Idea
Marx assumes, in general, that at least some of an ideology is false, that an ideology is the product of theorists who make biased claims undetermined by evidence, and that an ideology only supports the interests of the ruling class.
Gist of Idea
An ideology is largely false, is biased and unevidenced, and supports the ruling class
Source
report of Karl Marx (Collected works (w Engels) - 50 vols [1860]) by Jaime Edwards/Brian Leiter - Marx 5.0
A Reaction
[summarised] I tend to understand an ideology as simply the theory which guides any social movement, and that it is possible for an ideology to be very good. If a Marxist ideology is gradually improved, when does it stop being an ideology?
Book Reference
Edwards,J/Leiter,B: 'Marx' [Routledge 2025], p.151