Congress party president Sonia Gandhi, who is on a visit to Karnataka, was on Saturday greeted with black flags by members of the Madiga community who have been demanding reservations for a long time. Sonia is visiting the state to review the situation in drought-hit areas and take part in the birthday celebrations of Shivkumar Swamiji of the powerful Siddaganga Mutt in Tumkur. The Madiga community had led a delegation to New Delhi a month ago.