In 1942 the school placed an anonymous letter in the Daily Telegraph to recruit people who were crossword puzzle experts.

FORBES: I've got a secret

That all went up in smoke after an anonymous letter, presumably from a disgruntled former employee, was sent to a police department in Long Island.

FORBES: Inside Dope

It was revealed through a freedom of information request to a former councillor who said he had an anonymous letter revealing that some staff had a "buy out".

BBC: The Unison protest

That same month, an anonymous letter arrived at the S.E.

NEWYORKER: A Dirty Business

An anonymous poison pen letter was sent to Raymond and Sacha Hubbard, who own a garden centre, but the pair have resolved to keep their topiary effigy.

BBC: 10 stories that could be April Fools pranks but aren't

An open letter, purporting to be from Anonymous, accused the church of bigotry and fanaticism.

BBC: Westboro Baptist Church targeted by Anonymous

Last week an anonymous group of "netizens" posted an open letter on Chinese blogs and forums.

CNN: China delays Green Dam Internet filter

She agreed to testify only after Libby sent her a letter releasing her from the promise to protect him as an anonymous source.

NPR: Reporter Miller Returns to Stand at Libby Trial