Which group led efforts to establish rights for freed slaves during Reconstruction

Which individual below advocated that democracy would give way to socialism and capitalism would change into communism?

In a market economy, what does a producer mean when it asks, "is there a market for my products? is there a place where we can sell our products? " "ls our product being made more cheaply overseas? " will consumers need and want to buy our products? " will the government support demand for our products? "

Which statement best completes the diagram of the ways the different branches of government can limit each other's powers?