OK, I am puzzled. So far as I know, Aaron Swartz was not a threat to government officials or practicing counterfeit of any type of monetary instruments. I know that the Secret Service does other things but what was their reason for “TRACKING”, which implies a studied interest and action over a significant length of time!?
I did find it notable that Mr Swartz’s funeral had Congressman Issa (R-CA) and Senator Warren (D-MA) sitting together, as this death brought together the libertarian right and left together (loosely defined).
SS investigates computer crimes, not the FBI.