“On August 8, former Representative Eric Swalwell boarded a United Airlines flight from Frankfurt, Germany, to Washington, D.C. He didn’t know it, but federal agents were watching him throughout the nine-hour trip,” The Atlantic reports.
“The FBI had asked the Federal Air Marshal Service to covertly monitor Swalwell on board and to watch him use his electronic devices, to see whether its officers could visually ascertain his passcodes… Air marshals are trained to blend in with other passengers and quietly keep tabs on their subjects, who are usually suspected terrorists or potential hijackers, not politicians.”

