Around 200 alumni and 100 pupils from the elite King’s College in Mid-Levels formed a human chain on Thursday to protest against what they saw as the school’s suppression of students’ rights.Alumnus Sam Yip Kam-lung organised the event in collaboration with students after hearing King’s College did not grant pupils permission to use the school hall for a class boycott, and covered up the Lennon Wall that students had erected to express their views.The class boycott was part of a citywide…