"The African National Congress demands that Janusz Walus is immediately deported to his country of origin on his release; never to return to South Africa," ANC spokesman Zizi Kodwa said in its statement.
They further slammed the high court for deciding to release Walus a month before the party was due to commemorate the 23rd anniversary of the killing.
"The court's decision to release him exactly a month before we commemorate the 23rd Anniversary of the assassination of this towering hero of our struggle is extremely insensitive," the party said.
"Walus' imminent release is a travesty of justice and a tragedy for the Hani family and all South Africans who believe in human rights and who held a firm belief in our right to fight for freedom," the party said.