The principal source of controversy that it engendered was its statement that a number of Western scientists, including
Niels Bohr,
Robert Oppenheimer,
Enrico Fermi and others allegedly provided the Soviets with information regarding the
Manhattan Project, which has been deeply disputed. While a number of Soviet
atomic spies are attested to have stolen information from the American Manhattan Project, they were largely not the ones named by Sudoplatov. At times Sudoplatov contradicts facts directly, such as when he claimed
Leo Szilard and his secretary passed information to the Soviets, when Szilard did not have a secretary, and claiming that Szilard worked at
Los Alamos when he was working at the
University of Chicago helping build the first nuclear reactor in December 1942 with Enrico Fermi. Sudoplatov also claimed the existence of a de facto Soviet safe house, Zook's Drugstore in
Santa Fe, New Mexico, that first played a role in the first Trotsky assassination plot by
Iosef Grigulevich, and later continued use as a base for atomic espionage in
New Mexico. According to historian E.B. Held, this may have been disinformation on Sudoplatov's part to boost his accusations against Oppenheimer, who Sudoplatov claimed was codenamed STAR. American counterintelligence transcripts show that the identities of MLLAD and STAR were Theodore Hall and
Saville Sax respectively. Held suggests that pieces of disinformation in Sudoplatov's memoir in 1994 may have been a reason why the
Venona project was declassified in 1995. The book also confirmed that
Julius and Ethel Rosenberg had worked for Soviet intelligence although it argued that their role was not very important. ==Other subjects==