Answer:

hatemail

Answer	Crossword Clue
HATEMAIL	Angry letter in response to perceived crudity or politics in a crossword puzzle, say
HATEMAIL	Some anonymous letters
HATEMAIL	Venomous letters

HATEMAIL	Nasty letters
HATEMAIL	Poison pen letters
HATEMAIL	Form of intimidation
HATEMAIL	Often-anonymous intimidation technique
HATEMAIL	Nastygrams
HATEMAIL	Cross words?
HATEMAIL	Letters that are hard to read?
HATEMAIL	Some written rants

HATEMAIL	It may include a death threat
HATEMAIL	It's angry and often anonymous
HATEMAIL	Poison-pen letters
HATEMAIL	Sour notes?
HATEMAIL	Unwanted messages