Programming note: The AC360° documentary "The Bully Effect" will premiere at 10 p.m. ET February 28 on CNN.

By Kelly Daniel, CNN

(CNN) - An extraordinary documentary called "Bully" captured a behavior adults hear about, but rarely see: the way some kids pressure and relentlessly harass their peers. Filmmaker Lee Hirsch was embedded in several schools for an entire year. What he filmed was so raw and eye-opening that the project catapulted a movement, sounding the alarm about the critical and dangerous issue of bullying.

Something profound has also happened as a result. In the time since "Bully" was released, a number of kids and parents profiled in the documentary, and the filmmaker himself, have been on life-changing journeys, and in some instances have experienced remarkable transformations.

AC360° has dedicated the past year to tracing the course of their journeys and personal missions. We want to share their stories with you in a powerful documentary called "The Bully Effect," premiering on CNN on February 28 at 10 p.m. ET.

When Alex Libby was a 12 year old in Sioux City, Iowa, the slurs, curses and threats would begin even before he boarded the school bus. It escalated to such a frightening degree that Hirsch put down his camera and got involved in his subject's life. He warned Alex's parents and school administrators that he feared for the student's safety.

Read the full post on CNN's AC360° blog