At InnoTech I was followed by the FBI. Chronologically, not physically: they spoke next.
About InfraGard, which is a public-private partnership, i.e., the FBI organizes information sharing about intrusions and other security matters among businesses, academia, and law enforcement agencies. It has been going on since 1996, and has been national since 1998.
The InfraGard talk was mostly a good update on the current state of security, both online and physical, plus information on how to join.
-jsq