Solidarity gives DWS, Sisulu ultimatum over deployment of Cuban engineers Trade union Solidarity has given the department until Monday to respond to its legal letter and revoke the appointment of 24 Cuban engineers. FILE: Minister of Human Settlements, Water & Sanitation Lindiwe Sisulu. Picture: @The_DHS/Twitter. 4 hours ago JOHANNESBURG - The Water and Sanitation Department has been asked to present alternative proposals regarding its deployment of Cuban engineers in an effort to avoid a court battle. Trade union Solidarity has given the department until Monday to respond to its legal letter and revoke the appointment of 24 Cuban engineers. In the legal letter, Solidarity has ordered Minister Lindiwe Sisulu to suspend the engineering project or she may have to defend its rollout in court.