The role of radicals under TILAK in National Movement in India changed the course of movement.

• Tilak was a leader of the extremist faction of the Indian National Congress, known for his radical and aggressive approach to the independence movement.

• He believed in using mass mobilization and civil disobedience to achieve political goals, rather than the moderate approach of negotiations with the British government.

• Tilak's leadership played a significant role in the formation of the Swadeshi movement, which called for the boycott of foreign goods and the promotion of Indian industries.

• Tilak's involvement in the Home Rule League also helped to spread the idea of self-rule and sparked a wave of nationalistic sentiment among Indians.

• Tilak's impact on the independence movement was particularly significant in the early 20th century, when the movement was still in its formative stages and needed strong and decisive leadership.

• His aggressive tactics and uncompromising stance towards the British government helped to galvanize the independence movement and gave it a sense of purpose and direction.

Overall, Tilak's role as a radical leader played a crucial role in shaping the course of the national movement in India and helping to pave the way for the eventual independence of the country.