National Union of Dock Labourers

The National Union of Dock Labourers (NUDL) was a trade union in the United Kingdom which existed between 1889 and 1922. == History == The union was formed in Glasgow in 1889 but moved its headquarters to Liverpool within a few years, and was thereafter most closely associated with Merseyside.

Source: Wikipedia — National Union of Dock Labourers (CC BY-SA 4.0)