Vavi said it was shocking that Makhura had allowed government employees to continue working in the building despite knowing that it did not meet compliance standards‚ adding that at times workers were forced to walk up to the 20th floor as the lifts did not always work.
"We have taken a decision. We are going after you. These are not chickens or animals. These are human beings‚ fathers and uncles to someone. We will not allow them to die in vain‚" said Vavi.
"We are going to sue you even though we know you won't return their lives‚" he added.
Vavi said scores of government workers who worked there had repeatedly complained about the building but their complaints had fallen on deaf ears.
"Shame on you‚" he said.
Makhura was not present at the memorial.
Among the dignitaries who were there was Mayor Herman Mashaba and Councilor Michael Sun.