It's not at my school, but it's a local school that has really strict rules.
Students aren't allowed to hold hands or hug or such.
Students aren't allowed indoors during breaks.
Hoodies are not allowed to be worn, including hoodies handed out by the school (like the sports team hoodies).
Students are not allowed to be in groups larger than 3 people. Anything bigger than that is assumed a gang and is not accepted.
This school did have serious problems with some of it's students forming small gangs and fighting each other, as well as a case of someone going around smashing windows after school, and atleast 1 attempt at Arson.
The students from there still insist that their school is the best ever in the local area.