1. Non-essential - A title usually is the result of hard work, therefore, it's not necessary to include that appositive phrase.
2. Essential - It tells you who the Keystone Corps are. Otherwise, you would have no idea.
3. It's non essential.
Answer: (If the other one gets maxed)
Explanation: ^^ hewo buddies
In his letter to President Eisenhower dated back to May 13, 1958, Jackie Robinson addressed the issue regarding black civil rights. He expressed his frustrations on Eisenhower's lack of support for upholding black civil rights at that time and he moved to fight for Federal support on these rights.
