To answer your question,
From
his Letter from Birmingham City Jail, Martin Luther King, Jr. revealed to
readers that the police have a different public and private persona. In the
public, police are trying to exercise the utmost degree of discipline in
handling demonstrators. They are conducting themselves in a non-violent way in
public. But what is true behind bars is that not all lives matter the same.
Injustice and oppression are still seen and are very evident.
