I really can't find anything wrong with the essay. I'm really impressed by your creativity because it had me hooked and the ending was powerful also. You showed progression in the essay and how you conquered. The only thing I would suggest is connect the essay back to you, why did it appeal to you in a personal level. Maybe 1-2 sentences can show it, but then again your over 1000.
As the only high school intern, I juggled a multitude
As a high school intern, I juggled a multitude...
I began to understand how things worked at a labor union.
I began to understand the work process of a labor union...
That's the only I can make it concise. Hope it helps!
Good luck with your common app!
Can you give my Columbia Supplement a read?