The first party conference was held on 29–30 June 1991 in Zvolen.
KSS '91 contested the 1992 elections in the Czech and Slovak Federative Republic.
KSS '91 promoted keeping the unity of Czechoslovakia.
The party developed links to the Communist League of Slovakia (ZKS).
In 1992, KSS '91 and ZKS merged to form the new Communist Party of Slovakia.