Malcolm lied about himself to Macduff to test him; to make sure he was not bribed by Macbeth. He had to do this in order to see if Macbeth/Macduff would try to overthrow the throne.
The poem Harlem (A Dream Deferred) is written by African-American Poet Langston Hughes at the time of the Harlem Renaissance. The poet talks about a dream which is deferred or delayed.