Two names have surfaced in connection with Subhas Chandra Bose, as his trusted aids. One was Dr. Hiranmay Ghoshal, who apparently spied for Netaji Subhas Chandra Bose and was mysteriously fired from the Indian Foreign Service by Nehru according to this news item - https://www.indiatoday.in/news-analysis/story/hiranmoy-ghoshal-pandit-spy-netaji-subhash-chandra-bose-pandit-jawaharlal-nehru-1902833-2022-01-21
The second one was of Dr. Moni Moulik, a close associate of Subhas Bose who accompnaied him on his projects (of armament gathering - as claimed in the article) in in Germany, Italy and Czechoslovakia, and who was fluent in several European languages and thereby acted as Subhas Chandra Bose's translator, as per this article from his daughter Dr. Achala Moulik - https://www.sundayguardianlive.com/news/statue-subhas-chandra-bose
First, about Dr. Ghoshal - His father was a police official under British rule and his cousin was Panchanan Ghoshal, a police officer turned great detective fiction writer in Bengali. Dr. Ghoshal apparently knew twenty six languages, translated Gogol to Bengali, and earned a PhD on Chekhov. He travelled to Poland, witnessed the second world war and wrote a first hand account of it. He was an official of Indian embassy in Moscow, but fell out of favour of both Vijayalakshmi Pandit, Nehru's sister, who was the ambassador to Russia in 1947-48, and Nehru himself. It is not apparent from the article as to in what capacity he spied for Netaji.
Dr. Moulik helped Subhas in getting information from armament manufacturers and was interrogated on arrival in Bombay in 1938 by British Police. Being an associated of Subhas Chandra Bose, he was denied all means of livelihood in a British occupied India. Along with Justice Radha Binod Pal, he wanted to dig more on the so called plane crash of Netaji, but was possibly unsuccessful (or was he?). The trail ramn cold, but it is recorded that based on evidence collected Justice Radha Binod Pal did not believe that Netaji died in a plane crash. Therefore when public opinion was in favour of making him the head of the investigation committee, Nehru quickly appointed Shahnawaz Khan as the head. Coming back to Dr. Moulik, it is not apparent as to what his conclusion (on Netaji's so called death) and role was post independence. But it can be safely concluded that he perhaps shared the same view as Justice Pal, as they were partners in their private investigation and they both sensed something wrong.
Years later a great man said, "My men are in every key place (here and overseas). This time their garbs are legal - They simply cannot be touched or detected. Under their garbs they are working, they are in positions in all the key Capitals and the Nerve Centres which count, manipulating, pulling, suppressing, exploding, creating and forcing issues and policies, mystifying - clarifying and shaping..all only with a single purpose: This time no chances. No mistakes. No failures." (source: Bengali book Oi Mahamanab Ase, by Charanik, Jayashree Publication).
We do not know which men he talked about, but he certainly had influential associates in key positions across the world.