Here's evidence of Leon Trotsky and the Bolsheviks being funded and supplied by Imperial Bank of Germany through the Warburg banking dynasty.

Trotsky and Max Warburg. PAPERS RELATING TO THE FOREIGN RELATIONS OF THE UNITED STATES, 1918, RUSSIA, VOLUME I
https://history.state.gov/historicaldocuments/frus1918Russiav01/d371

File No. 862.20261/53
The Ambassador in Russia ( Francis) to the Secretary of State
[Telegram]
Petrograd, February 9, 12 p.m., to February 13, 1918, 1 a.m. 1
[Received February 13, 8.22 a.m., to February 16, 7.55 a.m.]

DOCUMENT NO. 9
Mr. Raphael Scholnickan,
Haparanda.
Dear Comrade: The office of the banking house M. Warburg has opened, in accordance with telegram from the Rhenish Westphalian Syndicate, an account for the undertaking of Comrade Trotsky. The attorney [?] purchased arms and has organized their transportation and delivery track Lulea and Vardö to [Page 376]the office of Essen & Son in the name Luleå receivers and a person authorized to receive the money demanded by Comrade Trotsky.
J. Fürstenberg
Note: This is the first reference to Trotsky. It connects him with banker Warburg and with Fürstenberg. Luleå is a Swedish town near Haparanda.