The Chief of the Gold and Currency Union, Seung Gwoon Gum Hung, was killed by Lee Chum Foon's flying dagger at the end of SENTIMENTAL SWORDSMAN, RUTHLESS SWORD. Was the death of its chief also a mortal blow to the union as well? Ging Mo Meng, after all, was still alive. He was capable enough to keep the union going (I don't know how many key union people were slaughtered by Ah Fei and Sheun Siu Hung at the same time that Lee Chum Foon faced off against SGGH).
The Gold and Currency Union was namechecked as late as FULL MOON, CURVED SABRE, which took place many decades after SENTIMENTAL SWORDSMAN, RUTHLESS SWORD, but I don't know if the union still operated during the time of FMCS or it was a thing of the past.