Independent secondary accounts drawing on Marta Balinska's Rajchman biography — entirely outside the FBI surveillance record — corroborate the 1957 dating and 'never returned' outcome of his US departure

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Three sources, each citing or drawing on Ludwik Rajchman's biographer Marta A. Balinska but independent of each other, of Wikipedia, and of the FBI's own surveillance file, converge on the same year and the same outcome that claim-fbi-file-confirms-siss-subpoenaed-rajchman-february-1957 and claim-fbi-file-shows-no-us-contact-with-rajchman-after-1957 establish from the US government's own paper trail:

• The Institut Pasteur's own archival chronology of Rajchman, citing Balinska's biography as its documentary reference, states: "in 1957, he is obliged to leave the country precipitously and never returns, settling permanently in France."
• Historian Josep Lluís Barona Vilar, in a 2021 biographical essay listing Balinska's biography among its sources, writes: "In 1957 he was forced to leave America and never returned, settling permanently in France."
• Central European University Press's own description of Balinska's book, reproduced on its Google Books listing, states Rajchman "was forced by McCarthyism to flee the U.S."

Barona had already published closely related wording on the same episode in Mètode (2014), cited in claim-ludwik-rajchman-squeezed-out-by-both-cold-war-blocs — his two pieces likely share text and are not fully independent of each other, only of the other two sources here. With that caveat, this is corroboration of the year and the outcome from a source lineage entirely outside the US surveillance record: the family biography and the academic literature that cites it, agreeing with the FBI file's own February 1957 subpoena date and its silence after May 1957.