Former members say leader David Miscavige struck subordinates; Church denies.
How Scientology Attracts Celebrities
Church sought to attract high-profile figures as "walking success stories."
Growing Up in Scientology's 'Sea Org'
Former members of the Church, including leader's niece, talk to "Nightline."
WATCH: Interview With Scientology Leader
Scientology's David Miscavige gave a rare interview to "Nightline" in 1992.
Scientology has a large following from many celebrities.
