Lenin was probably the greatest and most influential political thinker of the 20th century, no matter what you might think of him. His writings display profound intelligence and a keen grasp of Marxism, some writings that show these qualities in particular include The Development of Capitalism in Russia, Imperialism: the Highest Stage of Capitalism and Materialism and Empirio-criticism.

Friedrich Albert Lange has written:

'Logische Studien' -- subject(s): Logic, Theory of Knowledge

'Geschichte des Materialismus' -- subject(s): Materialism

'Geschichte des Materialismus und Kritik seiner Bedeutung in der Gegenwart: Buch 2'

'The history of materialism and criticism of its present importance' -- subject(s): Materialism

'The history of materialism' -- subject(s): Accessible book, Materialism

Of or pertaining to materialism or materialists; of the nature of materialism.

It's not a law.

Materialism and atheism don't necessarily have anything to do with each other; theistic materialism exists, and the materialism part is still the same (it's incidental that there is or isn't a god involved).

See "What is Materialism?" to better understand that part.

The book Materialism was written by Jorie Graham.