Expedite Removed from Airport. What to do?

I was on Student Visa in US for 1 year. Travelled to home country and while coming back, I got expedite removed from the Airport. Visa got revoked. I didn't received any forms from the Custom CBP. What to do?

Was on F1 Student Visa. Was helping a friend at his business for few days and there were records of it on Phone which was checked by CBP at Chicago Airport while returning. Student Visa cant have employement during studies, so I guess they revoked visa.