Question

why are the labours of the man called fruitless

Answer 1

The meaning of fruitless is useless or unsuccessful.

The men of the labor belong to a poor family and they suffer lots of problem like healthcare, child education etc.

After all, the government helps them a lot.

Somehow they are deliberately avoided by the social person or so-called rich men.

This so-called people usually say that they are useless or fruitless.