Sic a Parcel of Rogues in the Nation. Burnes's reworking of a song about the closure of the Scottish Parliament, but it's still relevant whenever there are dirty politics.
Blake's Jerusalem. He would turn in his grave if he knew it were part of the Anglican Hymnal.
Maybe Burnes's Is There for Honest Poverty qualifies too, but I'm not sure.
Just for the comic aide of things (perhaps best way to protest?) you've got Awa' Whigs Awa'. Paraphrasing part from memory: My love had a garden and bonny bloomed the roses Whigs came by and withered a' the posies.