Viacom
Looking for a new business venture, he set his sights on Viacom International, a company which he had already been buying stock in as an investment and was a spin-off of CBS in 1971 after the FCC ruled that television networks could not syndicate programs following their network run. Viacom syndicated most of CBS's in-house productions (such as Hawaii Five-O and Gunsmoke, as well as the pre-1960 Desilu Productions library which CBS acquired in 1960, I Love Lucy being among the acquired programs), but also made a lot of money from syndicating other programs, including most of Carsey-Werner Productions' shows (The Cosby Show, Roseanne, and A Different World), as well as syndicating shows for other companies (Columbia Pictures Television's All in the Family was one notable example, as was MTM Enterprises' The Mary Tyler Moore Show), and cable channels (Nickelodeon's Double Dare and Finders Keepers (co-syndicated with 20th Television) were two examples).
Viacom also owned MTV Networks (formerly known as Warner-AMEX Satellite Entertainment), which owned MTV and Nickelodeon. In addition, other included properties included Showtime Networks (a similar pay-television network to HBO and Cinemax) and The Movie Channel. Viacom acquired MTV Networks in 1985 for $550 million from Steve Ross' Warner Communications. (WCI bought American Express' share and then sold the entire entity to Viacom, as they felt that they could not make a lot of money from the venture and the bias of a studio owning cable channels would be a conflict of interest. The studio's stance changed in 1995, when as Time Warner it bought Turner Broadcasting.)
After a hostile takeover in 1987, Redstone won voting control of Viacom and led a series of acquisitions to make Viacom one of the top players in modern media (along with Bertelsmann, General Electric and Vivendi's NBC Universal, News Corporation, Time Warner, Sony, and Disney).
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