Gilberto Echeverri Mejía
A Liberal party politician , he had previously served as Ambassador of Colombia to Ecuador from 1975 to 1977 in the Administration of President Alfonso López Michelsen , Minister of Economic Development from 1978 to 1980 in the Administration of President Julio César Turbay Ayala , Minister of National Defence from 1997 to 1998 in the Administration of President Ernesto Samper Pizano , and was working as peace advisor to Governor Gaviria before he was kidnapped . 
<triplet> Alfonso López Michelsen <subj> Liberal party <obj> member of political party <triplet> Julio César Turbay Ayala <subj> Liberal party <obj> member of political party <triplet> Ernesto Samper Pizano <subj> Liberal party <obj> member of political party