Yeah it could be contact tracing for red scare purposes rather than actually looking for evidence of a shadow organization

After 9/11, as the FBI reoriented itself to fighting terror groups like al Qaeda, they focused on identifying and locating individuals and then mapping out their networks of family, friends and associates. That’s the Trump administration approach to Antifa, imagining an organization network that encompasses everything from membership cards to elaborate funding.

This approach was evident to Serafini, who told me: “I could tell by their questioning that they were trying to figure out the shadowy entity behind the protest.”

He added: “What a waste of their time to go after shit that doesn’t exist.”

The FBI seemed more interested in who was behind the protest than the protest itself, with the agents repeatedly asking about who had produced the protest signs, he explained.