private sector was not allowed in many industries during 1980s. i don't get it?

During 1980's the private sector was not allowed operations in many industries. Instead it was felt that an active role of the public sector was required to boost the development of industrial sector. You can find the reasons for the same at the below mentioned path.

Chapter 2 (Indian economy 1950-91)- Lesson 4 (Five-year plans and industrial sector)- Topic- Role of public sector in industrial development