the ptu continued to grow into a significant labour union and pressure group in the territory. according to do rosario, szeto even became one of "the most influential persons in hongkong's political scene mid-70s". due to its scale and influence, the ptu was put under surveillance by the standing committee on pressure groups (scopg) of the hong kong government in 1979. in the report, the ptu was noted by its influence and organisation. szeto was highlighted for his leadership and effectiveness in maintaining the ptu's independence against communist infiltration.