We've received a fair amount of information that there were...
We've received a fair amount of information that there were other people who were knowledgeable or seem to be associated with this group of people (the so-called 'Trenchcoat Mafia'),
We've received a fair amount of information that there were other people who were knowledgeable or seem to be associated with this group of people (the so-called 'Trenchcoat Mafia'),