Tehreek-e-Labbaik Pakistan are a new force in Islamist politics in Pakistan and are, to say the least, bad news.* The TLP's platform is pretty simple: kill all apostates and blasphemers. They aren't interested in much else.
*Tautology, obviously.
Huh, they're Barelvi. Usually I associate hardline Islamists in Pakistan more with Deobandis (esp. after they have had their minds exposed to the ubiquitous and lovely Saudi-funded mosques, madrassas, and so on). Ugh.
EDIT: I'm reading up on the TLP and its origin is starting to make more sense now, though no less depressing.