text: who regulates 501c(4) org. & can i find out how legitimate a particular group is? my elderly mother received solicitations from a seniors group making some outlandish statements and, of course, requesting money to fight an attempt by congress to give social security benefits to mexican, non-us citizens. if the seniors coalition is legitimate then their claims may be. the short answer is "no one regulates these groups".  they are unaccountable and usually funded by shadow groups and funders.  below are some links to those who are researching them.