St. Thomas More Societies are generally Roman Catholic lawyer groups, as St. Thomas More is the patron saint of lawyers. There is no national linking of these societies, with various cities or university campuses maintaining autonomous groups for various purposes. In Sacramento, there was an earlier group in the 1950s, and there is evidence of a student group at UOP-McGeorge in the 1980s.

STMS is an SCBA affiliate sponsored by Catholic lawyers, with our membership open to judges, lawyers, law students, legal professionals, and legislative advocates of any religious persuasion. For over 30 years, our organization has served as a mutual support group and a forum for interfaith understanding. The STMS does not engage in advocacy or take stands on controversial political questions.