Top secret
PersonalCopy to Comrades Kamenev and Zinoviev
Dear Comrade Stalin:
You have been so rude as to summon my wife to the telephone and use bad language. Although she had told you that she was prepared to forget this, the fact nevertheless became known through her to Zinoviev and Kamenev. I have no intention of forgetting so easily what has been done against me, and it goes without saying that what has been done against my wife I consider having been done against me as well. I ask you, therefore, to think it over whether you are prepared to withdraw what you have said and to make your apologies, or whether you prefer that relations between us should be broken off.[1]
Respectfully yours,
LeninMarch 5, 1923


Valid crashout. What the hell was Stalin thinking being so rude to a disabled man’s wife?
She kept giving him political materials that would get him worked up when he was directly tasked by the politburo to do nothing that would put risk to his post-stroke, post-assassination frail health.
Stalin was tasked by the politburo to oversee Lenin and ensure the directives to rest were followed. Krupskaya went against the will of the party and was admonished so.
https://www.marxists.org/archive/lenin/works/1923/mar/05.htm