I can't find a source for that, hence the IIRC.
On another point, it is my personal belief the socialism is the product of the basic human fear of life. For example, people who favor socialism/collectivism are like animals who fear the excitement and risk taking of life so much that they would rather live in a zoo.
Socialist leaders are those who would take advantage of that innate fear to become wealthy zoo keepers.
socialist zookeepers,
good one!