4.  The applicant was born in 1983 and at the time of lodging his application he was serving his prison sentence in Bolu F-type prison. 5.  On 10 December 2007 the applicant wrote a letter to a member of parliament, in which he had praised the imprisoned leader of the PKK, Abdullah Öcalan by using “Kürt Halk Önderi”, meaning the leader of Kurdish people. 6.  Pursuant to the Regulations on the administration of penitentiary institutions and the execution of sentences, the applicant was found guilty of breaching prison order by the Kocaeli F- type Prison Disciplinary Board (referred hereafter as “the Board”) and on 24 December 2007 the applicant was sentenced to 13 days’ solitary confinement, on account of his statements in the above mentioned letter. 7.  On 17 January 2008 the Kocaeli Enforcement Judge rejected the applicant’s objection. 8.  On 14 February 2008 the Kocaeli Assize Court upheld the judgment of 17 January 2008.