What happened after the movie 'Bully?'

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.