Operation Paperclip: documented, and sanitised at the time
The United States recruited around sixteen hundred German scientists after the war, and rewrote their files to get them past immigration. Both halves of that are in the record.

The programme turned on paperwork: security evaluations rewritten so recruits could clear immigration.
Documented, extensively. Operation Paperclip brought German scientists and engineers to the United States after the Second World War, in numbers usually given as around sixteen hundred. The programme is in the National Archives, has been the subject of official histories, and its participants had public careers.
Why it happened
The reasoning was explicit and it was about the Soviet Union. German expertise in rocketry, jet propulsion, aviation medicine and chemical weapons was the most advanced in the world in several fields, the personnel were available, and if the Americans did not take them the Soviets would.

The Soviets ran their own equivalent. This was a race for people, conducted in the ruins, and both sides understood it that way.
The part that is genuinely documented and often doubted
That files were altered. President Truman’s directive excluded anyone who had been more than a nominal participant in Nazi activities. Applying it honestly would have disqualified many of the people the programme wanted.
So the Joint Intelligence Objectives Agency prepared revised security assessments. Records show evaluations rewritten to describe candidates as not ardent Nazis, or as having joined organisations for professional reasons, in cases where the original assessments said otherwise.
This is not an allegation. It is in the archive, and it is the reason the programme has the reputation it does.
What Paperclip is not
It is routinely used as a bridge to unrelated claims — that recovered technology arrived with the scientists, or that they brought occult research, or that the programme is the hidden origin of subsequent secret aviation.
None of that is supported. What the programme demonstrably produced is well documented and entirely conventional: rocketry that led to Apollo, and substantial contributions to American aviation medicine and guidance systems.
The long shadow
Paperclip established a pattern that recurs through the rest of this section: a genuine national security rationale, an exemption from the ordinary rules to serve it, and a records trail deliberately shaped to survive scrutiny.
Every subsequent programme here has some version of that structure, which is why this is the right place to start.
Join the discussion
Still open on this one:
- 01
How many revised evaluations survive in both versions?
Where original and rewritten assessments both exist, the alteration is demonstrable rather than inferred. A count has never been published.
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See also
Everything this piece touches
Sources
Open them and check for yourself. Where a record is public, it is linked.
US National Archives and Records Administration
NARA
George Washington University
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