Answer:
Irony
Step-by-step explanation:
Irony is a literary device where what was expected to happen differs from what actually happens. This device was used by Gwendolyn Brooks in this poem above because even though it was expected that people had longed for the truth and were expected to embrace it when faced with it, the opposite seemed to be the case for they ran away from the truth. This can be further narrowed down to Situational Irony because what was expected to be the case was actually not what happened.