Politics and religion.

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The Union side is paid for by the dues collections from the salaries of the workers who are Union members.

As to the USPS being funded by taxpayer money, that isn't even remotely true. Outside of the money paid by Congress for free mailing for the blind, the USPS collects no tax money.

Any more myths you'd like to perpetuate?

No. I have to apologize for my spreading of myths and untruths. I did not think my argument through and did zero research.

I do appreciate your answers, and for correcting me.