Here’s some more:

In Adventurism (1914), Lenin places “Trotskyism” among groups representing “sheer adventurism.”

“… Trotsky behaves like a despicable careerist and factionalist of the Ryazanov-and-Co. type[.] Either equality on the editorial board, subordination to the C.C. and no one’s transfer to Paris except Trotsky’s (the scoundrel, he wants to ‘fix up’ the whole rascally crew of Pravda at our expense!)—or a break with this swindler and an exposure of him in the C.O. He pays lip-service to the Party and behaves worse than any other of the factionalists” (Lenin’s Collected Works Vol. 34, pp. 339-400).

“Roland-Hoist, like Rakovsky (have you seen his French pamphlet?), like Trotsky, in my opinion, are all the most harmful ‘Kautskians’, in the sense that all of them in various forms are for unity with the opportunists, all in various forms embellish opportunism, all of them (in various ways) preach eclecticism instead of revolutionary Marxism” (Lenin’s Collected Works Vol. 35, p. 200).

“... it was just as sad to read about the bloc between Trotsky and the Right for the struggle against N. Iv. What a swine this Trotsky is—Left phrases, and a bloc with the Right against the Zimmerwald Left!! He ought to be exposed (by you) if only in a brief letter to Sotsial-Demokrat!” (Ibid., p. 285).