Freedom United and LMN member group Eritrea Focus have published an open letter to London Listed company Aggreko plc. Aggreko has just signed an agreement to work with Australian miner Danakali on its Colluli Potash Project in Eritrea, which operates a system of state-backed forced labour. Seeing that Aggreko claims to have a “zero tolerance approach” to modern slavery, how can it justify working in Eritrea?