The worst violation of workers' rights occurs in Africa's export processing zones, trade unions have said. "The practice is also rampant in enterprises operating under the Africa Growth and Opportunity Act (Agoa), according to the International Confederation of Free Trade Unions, African region. "Due to their thirst for unbridled competition, often at the expense of severe social and labour rights, owners and sometimes with the tacit support of public authorities, have remained resolute in their opposition to unionisation," said the organisation's secretary-general, Mr Andrew Kailembo.