Besides environmental groups, unions, and investors, a relatively new type of watchdog organization that reports on corporate social responsibility efforts is

Socially conscious research organizations.

Explanation:

Apart of the environmental groups and the union and investor there exists a relatively new set of the organizations that hold responsibility of the corporate social responsibility are those of the non-governmental type of organizations that tends to be about the awareness in the government abu the environmental aspects that affect the planet at large ad is thus an essential part of the research organizations.