Best I could come up with is this speech by Stalin comparing Lenin’s frustrations with the Menshevik opposition to his own frustrations with the Trotskyist opposition who he accused of being a "handful of intellectuals divorced from life" making "false declarations" to "deceive" & "split" the Party. Nothing about "leading" the opposition, but he does threaten to send the Trotskyists "flying out of the Party", which is fun.
https://www.marxists.org/reference/archive/stalin/works/1927/11/23.htm