This net surveillance program (Levitation) supposedly discovers targets whose only ‘crime’ is to have downloaded pre-flagged suspicious files which when downloaded by a user, categorize the user as a target. The user’s IP is then used to search for everything about that user. Then any new information forms the basis for more investigation and more covert surveillance. The CSE does this without probable cause or a warrant. The truly unconstitutional part comes at the beginning in the labeling of an individual as a suspect. That the global intelligence databases are then searched to find incriminating evidence is just the usual illegal fishing expedition.
These are the kinds of interventions which curb our freedom on the web and which make people feel like they have no privacy, as well as the freedom to have their own thoughts and private interests.
My source for information about this program was an article at The Intercept.