Covered by administration officials last week in a contract for the insurer to silence, activists in Missouri accused Humana of using scare tactics aimed at seniors here . Springfield, Missouri Springfield, Missouri, News-Leader reported: Days after the Obama administration backed away from a ban on speaking against health, traveling a small group of state defenders headquarters of Humana in Springfield[Missouri] and a formal complaint. David Meinell, president of Bridgeton-based Missouri Alliance for Retired Americans and three colleagues presented an open letter to Humana CEO Michael McCallister and said that the insurer misled seniors and inappropriately used Medicare funds to their interests through mailings and advertisements .