A reader sent in this recommended website, which explains the Delphi Technique, how it works, and how it silences dissent while pretending to elicit opinions.
Diana Senechal reminds me that in Left Back, I described how social psychologists figured out how to manufacture consensus and how to exclude dissenting voices back in the 1950s. That is when they mastered the techniques of group dynamics, put a facilitator with a predetermined agenda in charge, and directed the discussion to whatever their goal was. Read pp. 336-338 to learn how “backsliders and dissidents” were silenced and corralled into supporting the group consensus.