First, identify a sub-group. Begin referring to the group as "they", as "other" than "us". Make sure they are not seen as heterogenous individuals - "they" are a single, malevolent entity.
Next, ascribe to them great power, unearned, over "us".
Then, ascribe to them ill-gotten wealth, power, control. All nefarious and self-aggrandizing.
Now describe them as "the problem", as "intractable", implying that something must be done - about them - to them.
Begin to use the language of violence, attributing it to "them". A blockade is an act of war, committed by an aggressor.
What do you think the outcome of this kind of rhetoric will be?