Bronstein, however, when asked about it noted that while he was responsible for the analysis, the text was largely written by someone named Vainstein. Mentioning that his feelings toward the Zurich tournament were mostly negative, he gave the impression that his estimate of the merits of this book were not quite so high as that of the reviewers.

However, just recently a new book has seen the light: "Secret notes", which David Bronstein co-wrote with Sergey Voronkov and only wanted it to be published after his death.

[...]

In the book, Bronstein also talks about how the Zurich 1953 candidates tournament was "fixed". He says that it was the most embarrasing moment of his chess career, (a tournament on which he wrote a memmorable book). There were 8 soviet GMs and US GM Samuel Reshevsky. The KGB monitored the event and instructed the players to arrange "rest draws" or even losses against the "chosen winner" (Smyslov) when the American GM was near the lead.
To avoid suspicions, the players even "prepared" the games before they were played.
A KGB agent even asked David: "Do you really think you've come here to play chess".
David Bronstein confesses that he never in his life did he forget the shame that he felt. "We were all puppets"...