I'm not sure of the percentages, but that same article includes this quote: "He was not alone. The F.B.I. deployed at least 12 informants, as well as several un

I'm not sure of the percentages, but that same article includes this quote: "He was not alone. The F.B.I. deployed at least 12 informants, as well as several undercover agents, according to defense filings." It depends on who one is counting as a conspirator, and 3/4 may well be an overstatement, but it seems true that a surprising number of the people involved were employed by the FBI in some capacity.