Question

who were moderates and extremists

Answer 1

Moderates believed in the policy of settlement of minor issues with the government by deliberations. But the extremists believed in agitation, strikes and boycotts to force their demands. Some nationalists led by Lokmanya Tilak agitated against the moderate behaviour of congress against Britishrule.

Answer 2

Moderates.
The congress leaders in the early stage came from the educated middle class.They were called moderates.Surendranath Banarjee,Dadabai Naoroji ,Pheroze what Mehta, Gopala krishna Gokhalae and Mahadeva govinda Ranade.