The Amalgamated Society of Papermakers came into existence in 1854 as the United Brotherhood of Papermakers, effectively a progressive splinter group of the Original Society of Papermakers. The UBP itself split in 1869 into the United Brotherhood and the Modern Society, the latter being opposed to the system of tramping for work. They reunited as the Amalgamated Society of Papermakers in 1894 and from the beginning of the First World War developed an ever closer relationship firstly with the National Union of Printing and Paper Workers and then with the National Union of Printing, Bookbinding, Machine Ruling and Paper Workers/ National Union of Printing, Bookbinding and Paper Workers. On January 1st 1937 the Amalgamated Society of Papermakers amalgamated with the NUPBPW to form part of the enlarged union's Papermaking Section.
Reference: C.J. Bundock, The Story of the National Union of Printing, Bookbinding and Paper Workers (Oxford, 1959)