craft and structure:what idea about america is hughes trying to convey by including the images of the steel of freedom and leeches on the peoples lives (lines 71-72)

These lines come from the following stanza, near the end of the poem:
Sure, call me any ugly name you choose—
The steel of freedom does not stain.
From those who live like leeches on the people's lives,
We must take back our land again,
America!
The speaker has spent several preceding stanzas lifting up the hard and often unrecognized work of Americans who have paved the way to a freedom that is not realized by all citizens: "the poor man's, Indian's, Negro's, ME." And he says that these same hardworking people..