What is the basis of payment of HRA to an workmen? is it necessary to pay HRA?

dinesh rajbhar
What is the basis of payment of HRA to an workmen? is it necessary to pay HRA to each and every workmen?
Can A workmen who is getting more/equal "Basic wage" but less "HRA" compare to another one, file complaint of unfair Labour Practice/ claim for hirer HRA
Example:
'A' workmen getting Basic wage 6000 and HRA 1000 conveyance 1000
'B' workmen getting Basic wage 6000 and HRA 2000 conveyance 800
'C' workmen getting Basic wage 5000 and HRA 3000 Conveyance 1000
A, B & C all are male workmen, working in the same unit of company and living in the same city.
In above example: Can 'A' & 'B' file complaint of Unfair Labour Practice,
will it attract any violation under Equal Remuneration Act, Minimum Wages Act and/or any other Act? if yes What defence is available to the employer/management.
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