Solution:Trade unions have played a pivotal role in advocating for workers' rights in India. Arranging them from the latest to the earliest formation:
National Council of Central Trade Unions: Established in the late 20th century as an umbrella organization for several trade unions.
Centre of Indian Trade Unions: Established in 1970, affiliated with the Communist Party of India.
Bhartiya Mazdoor Sangh: Founded in 1955, it's affiliated with the Rashtriya Swayamsevak Sangh.
Hind Mazdoor Sabha: Founded in 1948, it was a reaction against the perceived authoritarianism of other trade unions.
The Red Trade Union Congress: Among the earliest, it was active during the initial days of the communist movement in India. Trade Unions/Associations according to their formation from later to earlier is (e), (d), (a), (c), (b).