City Councilman David Ryu is working to keep his campaign promise of shaking up the status quo at city hall.

He has sent a letter to the city Ethics Commission requesting they look into the possibility of banning contributions to candidates by businesses, labor unions, and other groups.

He had planned to introduce legislation to accomplish this change; however, when no other council member would sign onto the legislation, Ryu turned to the Ethics Commission, asking them to explore ways to achieve such a ban.

While reform groups support such a ban, critics of the proposal fear it will lead to legal challenges and drive more money to independent expenditure groups.