The objective of this paper is to reconsider the relationship between marxism and existential-phenomenological sociology in light of margolis' (1978) recent articulation and systematic defense of what he terms nonreductive materialism--a material monist ontology which acknowledges an irreducible dualism of attributes. it is argued that reductive materialism is philosophically indefensible and that the most important reasons for thinking that marxism entails reductive materialism are mistaken.