The AFL was a formal federation of labor unions whereas the Knights of labor was much more of a secretive type.
I'm not sure if I remember correctly, but I believe it's C.) Passing laws that apply to actions taken before the law was passed.
Answer:
the second option- the levying of a federal income tax
Explanation:
In the event, the battle was won by the Royal Air Force (RAF) Fighter Command, whose victory not only blocked the possibility of invasion but also created the conditions for Great Britain's survival, for the extension of the war, and for the eventual defeat of Nazi Germany.