The published article is determined for studying such a question as the crimes against the procedure for obtaining reliable evidence, which interferes with the activities of the temporary investigative commissions of the Verkhovna Rada of Ukraine. The suggested article includes observing such a question as realization an investigation by temporary investigative commissions of the Verkhovna Rada of Ukraine is one of the leading forms of parliamentary control in Ukraine. The article produces such notions as the temporary investigative commission, the lawful procedure for obtaining reliable evidence, crimes against justice, witness’s testimonies, obligation of a witness to testify to the temporary investigative commission. The main attention is given to the methods of obstruction of the investigation of the temporary investigative commission, which are used by the witnesses. The key note concerns such issues as qualification of a witness’s refusal to testify by a temporary investigative commission of the Verkhovna Rada of Ukraine as disrespect for the Verkhovna Rada of Ukraine. This study is an оriginal proposal to solve the current problem of criminal law protection of the legal procedure for conducting an investigation by a temporary investigative commission of the Verkhovna Rada of Ukraine.