Also see: (https://en.wikipedia.org/wiki/Crypto_AG)
WaPo... "The Swiss firm made millions of dollars selling equipment to more than 120 countries well into the 21st century. Its clients included Iran, military juntas in Latin America, nuclear rivals India and Pakistan, and even the Vatican.
But what none of its customers ever knew was that Crypto AG was secretly owned by the CIA in a highly classified partnership with West German intelligence. These spy agencies rigged the company’s devices so they could easily break the codes that countries used to send encrypted messages."
More... https://www.cryptomuseum.com/manuf/crypto/index.htm
"In 2014, it came to light – from released documents of the Friedman Collection – that there had been some kind of Gentleman's Agreement between Hagelin and the NSA from 1951 onwards. As part of this deal, Hagelin would not sell secure machines to certain countries. And in February 2020, ZDF, SRF and The Washington Post revealed that in 1970 the company had been secretly purchased by the BND and the CIA, and that from 1994, CIA had been the exclusive owner [12]."