6. Heard learned counsel for the petitioners as well as learned Standing Counsel for the respondents and both the counsel have advanced their arguments in tune with the averments in the writ affidavits and counter affidavits, respectively. 7. Sri Koka Satyanarayana Rao, learned counsel for the petitioners in W.P.Nos.20541 of 2009, 2350, 3431, 10046, 17375 of 2010 and Sri A.K.Jayaprakash Rao, learned counsel for the petitioners in some other writ petitions in support of their contentions, relied on the judgments reported in Unni Krishnan, J.P and Ors etc. v. State of Andhra Pradesh[1] , Royal Talkies, Hyderabad and others v. Employees State Insurance Corporation[2] , State of U.P v. Jai Bir Singh[3] , Employees’ State Insurance Corporation and others v. Jardine Henderson Staff Association and others[4] , Lipton (India) Ltd., and another v. The Secretary to Government Employment and Social Welfare (Labour-I), Government of Andhra Pradesh, Hyderabad and others[5] , Jagbir Singh v. Haryana State Agriculture Marketing Board and anothe r[6] , S.Prakasha Rao and another v. Commissioner of Commercial Taxes and others[7] , Regional Director, Employees’ State Insurance Corporation, Trichur v. Ramanuja Match Industries[8] and Employees’ State Insurance Corporation v. Distilleries & Chemical Mazdoor Union and others[9] .