In Exodus the Israelites were an enslaved people for generations, just like the slaves we learn about in our history books. The slaves were inspired by the Israelites and how they fought for their freedom. this inspiration led them to write songs like "Go down Moses" and to keep firm in fighting for their freedom.
Marx and Engels believe and criticize that the existing social system causes the creation of paid wage laborers that have low pay and unfair long hours. These laborers work to fulfill society’s demands from more and more products which eventually will give more and more money for just a few people.
They also criticize that all relationships in family life are focused around gaining more and more money, which eventually also reduces sentimental values in the home.