Letters from an editor

So, I'm reading Dear Genius, the Letters of Ursula Nordstrom, collected and edited by Leonard S. Marcus and mumbling to myself, "Why don't editors write letters like these any more. There she is, practically begging authors to send her stuff."

And the letters of encouragement she sends.  WOW.

And then I hit this letter -- and burst out laughing.

To Hilary Knight,  September 18, 1964.
    I hesitate to worry you, but I thought I should tell you that some enemy of yours is writing me very angry letters, and signing your name to them.
Have a good week.
Love,

   ==  ==  ==  ==  ==
The footnote (you gotta read every footnote in this book as well) explains that there had been a series of delays about the publication of a book and tempers were getting a little frayed all around.  Marcus does NOT give us the letter from Hilary Knight that inspired this response but it sounds like it had been a letter we are cautioned to never ever send to editors nowadays for fear of offending them.