Who developed a severe communism

Most modern forms of communism are grounded at least nominally in Marxism, a theory and method conceived by Karl Marx during the 19th century.

i'm asking the same thing i asked this other cat all of

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.