Rabbi Moshe Chaim Luzzato, known as Ramchal, was a controversial and prolific Italian philosopher and Mekubal.
According to the linked Wikipedia article, after disseminating Kabbalah in Italy, "leading Italian rabbinical authorities were highly suspicious and threatened to excommunicate him." Furthermore, this biography also mentions that "[w]hen word got out of Luzzatto's messages, the rabbis of Venice became alarmed, considering such mystical activities dangerous."
What are the names of these Rabbis, and do we have any texts from that time about the proposed excommunication of Ramchal?