Scientology contribute a proportion of their income and comply with the Religious Technology Center (RTC) and its standards. Operating Thetan levels are offered only at Scientology's Advanced Organizations (Los Angeles, Sydney, East Grinstead and Copenhagen). The Flag Service Organization in Clearwater, Florida offers OT levels VI and VII. The Scientology ship "Freewinds" offers OT VIII. In 1955, Hubbard created a list of 63 celebrities targeted for conversion to Scientology. In a church policy letter in 1973, L. Ron Hubbard wrote, "The purpose of [the] Celebrity Centre is, to forward the expansion and popularization of Scientology through the arts." Scientology operates eight
Church of Scientology Flag Service Organization deliver the "Advanced Technology" to its public members while guaranteeing weekly payments to the RTC of 6% of the monetary value of the "Advanced Technology"-services delivered by the FSO. The Church of Scientology International (CSI) presents itself as the mother church of the Church of Scientology worldwide. As such, it has the right to use and sub-license various Scientology trademarks and service marks. Consequently, CSI has entered a number of agreements with other subordinate organizations in the Scientology hierarchy, such as the FSO: According to its 1993 application for tax exemption, the corporation "Church of Scientology Flag Service Organization, Inc."