Air traffic controllers take the responsibility of civil aviation safety and in charge of air traffic management. The specific job is surveilling and directing the whole flight of aircraft.

民航空中交通管制员承担着民用航空的安全重任，负责民航空中交通的管理工作，对民用航空飞行器飞行过程的全面监控和指挥。

youdao

They played a big role, for instance, in Haiti in terms of surveilling the needs there and helping to coordinate the assistance.

WHITEHOUSE: The White House

This means surveilling foreign student groups in the U.S., certain immigrant communities that have produced jihadists, and, yes, even mosques and other Muslim venues.

WSJ: Review & Outlook: The Brothers Tsarnaev

Neighbor Bonnie Duggan said it did not take "a rocket scientist" to figure out the FBI had been surveilling Ivins on and off for about a year.

CNN: Two sides of scientist emerge after suicide