Madiga is a community - majority of them are based in the state of Andhra Pradesh, in India. Madigas are progressive. Historically they have been the less-privileged community due to age-old oppression by other upper-castes. The good news is that there are few prominent Madiga's who, despite many odds, went to chart out some of the most respected profiles in the world.
Below are some of the resources you can access to learn more about Madiga and Madigas:
http://en.wikipedia.org/wiki/Madiga
http://indculture0.tripod.com/madiga.htm
http://www.religion-online.org/showarticle.asp?title=2451
http://en.wikipedia.org/wiki/Manda_Krishna_Madiga
http://www.odi.org.uk/resources/download/1998.pdf
