Why is the Pashtun leader Ali Wazir still in Pakistani jail?

Pashtun leader Ali Wazir was arrested by the Pakistani regime and thereafter several false cases were lodged against him. Ali Wazir continues to languish in Pakistani jails and Rawalpindi refuses to release him.
Over the last three weeks Pashtun Tahafuz Movement (PTM) has been protesting in Karachi for Ali Wazir's release.
Watch this video report to understand why was Ali Wazir arrested, and why is the Pakistani regime not releasing him.
Video Language: Hindi/Urdu