Conferences, like associations, are congregationally representative bodies, with each local church sending ordained and lay delegates. Most current UCC conferences were formed in the several years following the consummation of the national merger in 1961, and in some instances were the unions of former Congregational Christian conferences (led by superintendents) and Evangelical and Reformed synods (led by presidents, some of whom served only on a part-time basis). A few have had territorial adjustments since then; only one conference, the Calvin Synod, composed of Hungarian-heritage Reformed congregations, received exemption from the geographical alignments, with its churches scattered from Connecticut westward to California and southward to Florida. Only one conference has ever withdrawn completely from the denomination: Puerto Rico, expressing disapproval of national UCC tolerance of homosexuality (as well as that of a large number of mainland congregations), departed the denomination in 2006, taking all of its churches.