It is usualy less discused the impact of this secret services before, during and after WW II, and how they probably manage to switch the balance of victory in some instances influencing the course of war, and even history.
I think the best was NKVD and GRU of SU, followed by Abwher and Gestapo of Germany, then UK and US, maybe even Japan.
NKVD/GRU had info from super spy Richard Sorge that Japan will not invade in far east, so bring new fresh troops from Siberia to stop the germans in front of Moscow, the first huge blow who shattered the Wermacht in east, and show them that they are not invincible. With out that, and if Moscow had fallen, who knows what the turn of the war in east will was. They had as well the Red Orchestra agents in Germany, Lucy network, Cambridge net spy in UK, and receive the secret of atomic bomb from US, managing to come almost on par with all west with implications up to this days.
Abwher/Gestapo- very good in east in Russia, under Gehlen command, unfortunately not trusted from the first, they manage to put down almost all spy networks from allies on the continent (except some soviet ones), and received the D-day plans in Ankara, stolen from british embassy, but this again wasnt used or trusted by german high command, who knows how the landing on Normandy will come if they did that. It was supposed that admiral Canaris, the commander of Abwehr, was the one who send to british the so called "Stockolm report", with infos about german new weapons, and that he was against Hitler all this time but this are just suppositions.
SIS of UK, manage to destroy all the Abwher networks in UK, and obtain the Enigma coding machine, so able at some point to fight very well against german U-boots, but generaly wasnt something near at the level of previous two services, faired poor on counter-intelligence against russians, not just before and during WWII, but after as well.
USA- mostly using technic sources, they manage to decode the japanese transmissions, very good for battles in Pacific (there is even a conspiracy theory that americans or Roosvelt know because of that about the attack at Pearl Harbour, but let it to be done, so have a reason to enter the war). And, as one very important moment, they find like that the inspection plan of japanese commander, admiral Isoroku Yamamoto, the most important and capable japanese comander, and put down his aircraft killing him, and giving a huge blow to japanese navy. Not very good in counter-intelligence as well, during WW II especialy, but after too, especialy against the same russians
Japan- had agents on Hawai, who send all the necessary info about the island and harbour, so japanese aviation and navy can strike precisely and well what they want.
Other secret services who might be considered wasnt on top at that moment, or not even existed, and can be discussed separate (Mossad or french ones)




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