HILLONG: The Hynniewtrep Achik National Movement (HANM) has called blockade for two nights on February 20 and 21 from 8 pm to 6 am the next day in Khasi and Jantia Hills in protest against the delay on the part of the Government in releasing its West Khasi Hills unit president Arphul Karbani, who is lodged at Williamnagar jail.