Usually the beliefs are impossible to put into practice because of legal constraints like rules against discrimination.

That's true of some of the beliefs yes, but not of all. For example, many socialists believe (or at least used to believe) that large organizations (states) could efficiently allocate resources across a wide range of industries, without making much use of market prices. If you believed that, you might like to invest in conglomerates (which many investors dislike because they think conglomerates are bad at capital allocation across industries) and vertically integrated firms (which make less use of market prices of intermediate goods than non-vertically integrated firms).

Thanks for the direct suggestion! The former would have direct relevance for venture capitalists.