Bilandžić was member of the Steering Committee of the Croatian Mainstreem of Emigrants,[REF] member of the Commission of the Presidency of the Socialist Republic of Croatia for Pardon[REF] and member of the Presidency of the SR Croatia [REF].
He was decorated with Order of Danica Hrvatska with face of Ruđer Bošković for his contribution to science,[REF] and Annual Award for Science, which he gained for his work Croatian Modern History (Zagreb, 1999) [REF].