<Tr> <Td> Laundry Workers' International Union </Td> <Td> 1900 </Td> <Td> 1900 </Td> <Td> 5,500 </Td> <Td> </Td> </Tr> <Tr> <Td> Leather Workers' International Union, United </Td> <Td> 1896 </Td> <Td> 1896 </Td> <Td> 2,000 </Td> <Td> Journal: Leather Workers' Journal . </Td> </Tr> <Tr> <Td> Letter Carriers, National Association of </Td> <Td> 1889 </Td> <Td> 1917 </Td> <Td> 32,500 </Td> <Td> Journal: Postal Record . </Td> </Tr> <Tr> <Td> Letter Carriers, National Association of Rural </Td> <Td> 1919 </Td> <Td> 1919 </Td> <Td> 300 </Td> <Td> </Td> </Tr>

One reason the american federation of labor (afl) was successful was that this organization