Within the group he was known as a keen negotiator and mediator , working to resolve issues between members ; he also preached at the local mosque .
During this time Sudirman also continued to serve as a member of the Muhammadiyah Youth Group .
Within the group Sudirman was known as a keen negotiator and mediator , working to resolve issues between members ; Sudirman also preached at the local mosque .
During this time Sudirman also continued to serve as a member of the Muhammadiyah Youth Group .