open letter

noun

a letter, often of protest or criticism, addressed to a specific person, but intended to be brought to public attention.

open letter

a letter, esp one of protest, addressed to a person but also made public, as through the press

First recorded in 1875–80

He wrote an open letter—posted to the conservative blog Power Line—that quickly went viral.

In an open letter to British newspapers, he warned reporters to stay away.

In an open letter to the governor, Beck himself wondered if Cuomo wanted to bring tyranny to the state.

In a Daily Beast exclusive, here is his open letter about the film, which is currently seeking crowdfunding.

Blue Is the Warmest Color director Abdellatif Kechiche pens open letter attacking star Lea Seydoux.

Lang bleats for one, and I thought I might address it to him as a kind of open letter.

I was treated to an open letter, signed "Junius Secundus," and I replied in provocative terms.

He stared at the open letter as if it possessed the eyes of a basilisk.

And going into the other room, Frank returned in a moment with an open letter, still wet from the copying-press.

He laughed uneasily, but made no reply, as Bernardine entered the room at that instant with an open letter in her hand.

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