hatchet job 
noun informal
A fierce written attack on someone or their work: she does hatchet jobs, not reviews...
- Lucy's desire to write a book is buffered by the total hatchet job she does on her husband and friends.
- His tirade in today's Herald Sun was a complete hatchet job on him.
- During that bout, he did a hatchet job book on C.S. Lewis, wrote any number of inane diatribes against theism in general and Christianity in particular.
Synonyms
savage, attack, lambaste, condemn, criticize severely, flay, shoot down, pillory, revile
informal jump on, tear to pieces, take to pieces, take/pull apart, lay into, pitch into, hammer, slam, bash, crucify, give something a battering, roast, skewer, throw brickbats at, knock
British informal slate, rubbish, slag off
North American informal bad-mouth, pummel
Australian/New Zealand informal trash, bag, monster, give someone bondi
archaic excoriate, slash