The two societies propose the establishment of a commission of inquiry to investigate claims that some MPs illegally influenced the nomination of candidates, Matica Hrvatska secretary-general Zorislav Lukic told a news conference in Zagreb.
The two societies also believe that a majority of the nominees do not represent associations and institutions, as required by legislation on Croatian Radio and Television.
The Croatian Helsinki Committee (HHO) on Wednesday stated that the list of nominees for the Programmes Council of the national broadcaster (HRT) "does not express the will of the civil society" and that the nominations were a result of political trading with the aim of retaining political clout over Croatian Radio and Television.
The HHO said that among the nominated candidates there was no prominent individual proposed by culture institutions or human rights organisations and that there was no representative of ethnic minorities, religious communities or academic associations.
On 17 February, the parliamentary Committee on Information and Media unanimously proposed 11 candidates as members of the HRT Programmes Council. Josip Jovic, Petar Lovric, Milan Kujundzic, Darko Grivicic, Branka Pavlic and Viktorija Car were nominated by the ruling coalition, while Ivo Goldstein, Sanja Ivic, Branko Karabatic, Nada Zgrabljic Rotar and Ante Tomic were proposed by the opposition.