pick a text type that is different from The Crucible, so seeing as it's a play your open to pick poems, images/paintings, films, novels, etc.
In terms of a solid text you could look at Animal Farm by George Orwell, this text links quite nicely since it has similar interactions (in a way with politics) and could be a nice text to study alongside The Crucible.
But of course, as long as you pick a text that shares some similar values/ideas you should be ok.
House of Cards (Tv series)
We steal secrets: Wikileaks Documentary
Winston Churchill's Speeches
Julian Assange - The Unauthorised Autobiography
An Inconvenient Truth (Documentary)
If This Is a Man / The Truce- Primo Levi (Novel)
Extremely Loud and Incredibly Close - Jonathan Safran Foer(Novel)
Birdsong-Sebastian Faulks (Novel)