For a dead girl, Alison DiLaurentis (Sasha Pieterse) sure does manage to pop up everywhere on Pretty Little Liars. The shadow of Ali's misdeeds hangs over Rosewood, and we thought it was high time to take stock of exactly who she screwed over back in the day. This might provide us some useful context for the Season 3 finale and all of the answers it's supposed to provide.

The Liars.
Obviously, all four Liars suffered at the hands of Ali and her mean girl ways. From toying with Emily's (Shay Mitchell) heart to provoking Aria (Lucy Hale) into trashing her dad's office, the only people Ali was worse to than her enemies was her friends.

Jenna.
Hey, remember that time Alison (and the unwitting Liars) blinded Jenna? Yeah.

Toby. As if blinding Jenna weren't bad enough, Ali then blackmailed Toby into taking the blame. You know, in case you'd somehow forgotten that he has a pretty legitimate reason to hate Ali and all of her friends.

Mona. Ali's bullying might not justify becoming "A", but there's no question that she was pretty awful to poor, nerdy Mona.

Lucas. See Mona. Alison was not a nice person.

Byron and Meredith. Ali blackmailed Aria's dad over his affair with Meredith. Oh, Ali.

Melissa Hastings.
Ali had an affair with Melissa's boyfriend, Ian.

The N.A.T. club. Ali's relationship with the N.A.T. club is still not entirely clear, but she obviously knew about their activities, had their videos, and therefore posed a threat.

Paige. Ali had a rivalry with Paige. As is normally the case when you go toe-to-toe with Ali, Paige lost out. Ali got her hands on a love letter Paige penned to Emily, which Ali used as blackmail against Paige.

CeCe. Ali got her mentor kicked out of college because why the heck not?

Did we miss anyone major? Let us know in the comments below.

Find more Pretty Little Liars spoilers here.

Catch the Season 3 finale tonight, Tuesday, March 19, 2013 at 8 p.m. ET/PT on ABC Family.