http://www.ilo.org/public/english/standards/index.htm 
International Labour Organisation, Standards and Fundamental principles and rights at work

http://www.ohchr.org/english/law/index.htm 
UN Core International Human Rights Instruments and their monitoring bodies

http://www.unglobalcompact.org/ 
UN Global Compact

http://www.ohchr.org/english/bodies/cmw/index.htm 
UN Office of the High Commission for Human Rights, Committee on Migrant Workers