How does Martin Luther king employ allusion and what effect does it achieve in his "Letter from Birmingham jail"?

Awesome, I answered a similar question before.

When someone is alluring to something, they are referencing it usually indirectly.

MLK is directly referencing clergymen, and is alluring to the townspeople and he can be interpreted as alluring to the nation.

MLK employs this literary technique by referencing renown civil rights activists. He gains the support of the masses by this and makes them think of connections in their mind, how do they personally relate to what he is saying.