George Milligan, a District Secretary of the NUDL, recalled that organisation in the Liverpool docks suffered a severe blow after the banning of the badge between 1890 and 1911.
Sexton estimated that the NUDL suffered a 50 per cent drop in membership immediately as a result.
The ship canal company refused to allow NUDL members to wear their badges in their coats and locked them out.
The NUDL gained recognition in the south end of the Liverpool docks from 1890 and preference was given to badge wearers at the stands, but once inside the docks the badge had to be removed.
In 1911 the seamen's strike, in which the NUDL were involved, gained union recognition by its employers and restored the right to wear the union badge freely.