French intelligence learned of the plot months early but ignored the tip-off

Evidence

Meanwhile, as preparations for All Saints inched forward through every obstacle, the French administration was beginning to form a menacingly accurate picture. As early as April 1954, the office of the governor-general, Roger Léonard, received a tip-off from an informer about the formation of C.R.U.A.; but it appears to have been filed away in some forgotten drawer. — Horne, Alistair, A Savage War of Peace- Algeria 1954-1962, 259

Categorization

• XREF: Institutional dismissal of warning signs parallels other intelligence failures the reader may know, e.g. Pearl Harbor or the Sétif pattern of French underestimation. — connects to: French intelligence warnings were dismissed during the holiday season; Paris received precise warnings of the putsch but ignored them — Horne, Alistair, A Savage War of Peace- Algeria 1954-1962, 1361

Related

• French intelligence warnings were dismissed during the holiday season (similarity 0.94)
• Paris received precise warnings of the putsch but ignored them (similarity 0.89)