Who was the national leader that led the republic of congo to independence?

The national leader that led the Republic of Congo to independence was Fulbert Youlou. He served as the first President of the Republic of the Congo from 1960 to 1963.

What political party did he belong to?

Fulbert Youlou belonged to the Democratic Union for the Defense of African Interests (Union Démocratique pour la Défense des Intérêts Africains, or UDDIA).