The author makes a connection by showing that city workers are completely dependent on farm workers, but completely underestimate their work. This dependence is due to the fact that they are the workers of the farm that produce all the food that the workers of the city need to have to be able to do their activities.
This shows that even if they are undervalued, farm workers are essential. This is related to the idea of the forgotten man, because it shows a group of people of extreme importance to the country, being devalued and completely forgotten.
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The singular regard is correct in phrases like with regard to and in regard to, meaning with reference to, while the plural regards expresses respect, affection, or condolences. So yes, it’s grammatically correct.
