Although Marx's labor theory of value has been thoroughly trashed by Occam's razor and no longer enjoys any intellectual respectability, it still persists in the form of a quasi-religious dogma, kept alive by a disturbingly large number of otherwise intelligent Earthlings. This dogma cannot be questioned or challenged, because without it there is nothing left of the critique of capitalism as a system that exploits workers that stems from it; and Marxians are unlikely ever to give up on this conclusion just because it cannot be supported.
So please listen to this slightly wonkish, but hopefully still accessible, discussion of how Marxist economic and political theorizing has morphed into the religious movement of Marxianity.