Shimla, September 28 Residents and representatives from over 20 villages in Gagret area of Una district today staged a protest against the proposal to set up SEZ and Airport by SKIL Infrastructure Ltd. The Central Government had granted in principle approval to the Special Economic Zone (SEZ) two weeks ago. Over 200 people held a rally under the umbrella of Matribhumi Sangharsh Samiti at Bhanjal village near Mubarakpur in Amb and burnt the effigy of Union Commerce and Industry Minister Kamal Nath.