The American Sabbath Tract Society published a periodical called The Peculiar People, subtitled a Christian monthly devoted to Jewish Interests, for a couple of years in the 1890s. Here is its platform:
This is an article about a cherem against a Christian hospital associated with various Christian missions in Jerusalem, including one run by a Sephardic Jewish apostate. The signatories are Jerusalem's Rabbis Ya'akov Shaul Eliashar, Yehoshua Leib Diskin and Shemuel Salant.
Here's a notice about a Karaite rabbi with reformist tendencies: