<human>:  Who was the founder of the theory of ‘Collectivism’?
<bot>: The theory of collectivism was developed by Karl Marx. Marx believed that society was divided into two classes: the bourgeoisie and the proletariat. The bourgeoisie were the wealthy, while the proletariat were the poor. The proletariat were forced to work for the bourgeoisie and therefore had no control over their lives.