I phoned him because he was not home.
The second part of the sentence is now dependent on the first as it cannot stand alone as its own sentence.
King shows that the struggle for freedom and equality is not over by giving examples of violent events that recently took place. This shows the discrepancy between the laws and what's really going on. Therefore, a further struggle is necessary if people want to succeed.
A label attached to someone or something for the purpose of identification or to give other info
