For safety-valve relief in sentencing after a conviction for conspiracy, the relevant conduct that must have been disclosed to authorities prior to sentencing includes all conduct in furtherance of the conspiracy, including that of all conspirators, charged and uncharged.
Threat of retribution insufficient to justify concealment of relevant knowledge of the crime.
http://media.ca1.uscourts.gov/pdf.opinions/19-1667P-01A.pdf