The advertisements were tailored for Chinese college students far from home struggling with the English language and an unfamiliar culture.

Coaching services peppered the students with emails and chat messages in Chinese, offering to help foreign students at U.S. colleges do much of the work necessary for a university degree. The companies would author essays for clients. Handle their homework. Even take their exams. All for about a $1,000 a course.

For dozens of Chinese nationals at the University of Iowa, the offers proved irresistible.