In this context, the 'of' is necessary because it denotes a (one) group of capitalists ( the robber barons) , rather than all the most notoriuos capitalists , regardless of which group they belonged to.
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Stenka25I have read in a book a linguistic maxim, which says that if we have different word order or composition, its meaning is different in a precise sense.That could very well be, but does it also say in that book that it may be impossible to express in words what this difference might