You have not mentioned what your basic qualification is and at what level you want to enter the service in these organisation. Please note that the Labour Department comes under the State Government. The EPFO and ESIC are separate organisations under the Central Government. There are different level of entries in these organisations. You may visit their websites and see what sorts of vacancies are available and what is the required qualification. You can also regularly see the 'Employment news' (news paper, published by the central govt.) wherein all employment advertisements are published in detail.