Nearly half the students at a large Bronx high school were suspended last school year, according to the Department of Education, which is now required to release crime and suspension data.
Lehman High School in Westchester Square tops the list of schools with discipline problems, with 2,000 of the school's approximately 4,100 students receiving suspensions.
Of those incidents, DOE sources say 122 suspensions were for "horseplay," 219 were for aggressive behavior and 456 were for insubordination.
Lehman has been in trouble in recent months, as its former principal resigned amid a grade-fixing scandal.
The school also received an "F" in two consecutive performance reports.
Citywide, suspensions were up 2 percent compared to the year before, but crime has gone down.
The report says that major crimes such as rape, homicide, robbery, felony assault and burglary dropped nearly 5 percent during the 2010-2011 school year, compared to the previous year.
Misdemeanors have also declined.