Ohio State University has suspended activities by all fraternities because of numerous investigations facing several houses.
The letter indicates that chapters must only conduct "essential activities", which excludes social and recruitment activities.
The University of MI launched an investigation into fraternities on campus after the student-run Interfraternity Council last week voted suspend activities amid a slew of hazing and sexual misconduct allegations.
"[Eleven] of the 37 IFC chapters have been under investigation since the school year began", Isaacs wrote.
Ohio State Buckeyes campus in Columbus, Ohio on August 2, 2001.
"This is an unacceptably high number, and the university will not tolerate behavior that puts the health and safety of students at risk", director of Greek life Ryan Lovell said in a message to fraternity presidents.
Issues regarding alcohol and hazing problems have plagued universities across the country. The culture- and service-oriented chapters of the Multicultural Greek Council are exempt from the suspension as well.
Drew Cooper, the president of Ohio State's IFC said in a statement that they are committed to "collaborating with parents, the University, chapters, and their national or worldwide headquarters to advance safety and accountability in our Ohio State fraternity system".
"However, when individual members or organizations fail to live up to the standards and values. the entire Greek community suffers". Fraternities are expected to submit a list of "essential activities" scheduled to occur between now and January 7 - such as chapter and executive meetings - to Lovell's office for approval.
Drew Cooper, the president of the IFC at Ohio State, said the council plans to work toward a solution.
The university did not provide additional information on how long the suspensions will last, or what factors will be considered in lifting the ban.
On Monday, a prosecutor filed new charges against 12 members of a Pennsylvania State University fraternity in connection with the death of a 19-year-old student in February after an alcohol-fueled initiation rite.