( CNN ) -- South Korean union and civic groups are gearing up for large protests against the G-20 , which plans a summit in Seoul in November . About four dozen union and civic groups have joined to oppose G-20 efforts , such as globalizing financial systems , the Korean Confederation of Trade Unions has announced . Businesses have maximized profits while eroding workers ' job security and labor rights , said the trade union , which aims to highlight such issues . Collectively , the Group of 20 accounts for about 85 percent of global economic output . The 1997 Asian financial crisis prompted creation of the group , which aims to stabilize the world financial market . The G-20 includes industrialized nations and developing economies , which focus on economic issues and economic policy coordination . The Group of Eight continues to focus on issues such as global security . The G-20 held its last summit in June in Toronto , Canada . Hundreds of protesters were arrested as violence and vandalism broke out . Cars were set on fire , windows were broken and graffiti was sprayed . Some protesters were tear gassed , though no serious injuries were reported .
About four dozen groups have joined to oppose G-20 efforts . The Group of 20 plans a summit in Seoul in November . Collectively , the G-20 accounts for about 85 percent of global economic output .