The tax status of the Church of Scientology in the United States has been the subject of decades of controversy and litigation. Although the Church of Scientology was initially partially exempted by the Internal Revenue Service (IRS) from paying federal income tax, its two principal entities in the United States lost this exemption in 1957 and 1968. This action was taken because of concerns that church funds were being used for the private gain of its founder L. Ron Hubbard (according to the IRS) or due to an international psychiatric conspiracy against Scientology (according to Scientology).