the CBS color system. CBS color broadcasting only lasted for four months. CBS suspended it when the manufacture of color television receivers was halted by the US government as part of the Korean War effort. When the ban on color sets was rescinded in 1953, CBS announced that it had no plans to resume broadcasting using its field-sequential color system. A major problem with the CBS system was that the video was not "compatible" with existing black-and-white TV sets. A competing dot-sequential color system being developed by RCA was compatible, and in late 1953, the FCC switched its approval to an RCA-based system of broadcasting color TV. 1950s controversies During the period of McCarthyism, Stanton created an office at CBS to review the political leanings of employees. Although right-wing journalists considered CBS left-leaning, branding it "the Red Network," CBS maintained a questionnaire inquiring about journalists' political affiliations. At Stanton's direction, employees were required to take an oath of loyalty to the US government. Stanton and Paley "found it expedient to hire only those who were politically neutral" as they wished to avoid taking a position against the FCC and Congress or to jeopardize profit by taking "a stand against the vigilantes." According to radio historian Jim Cox, "CBS and the blacklisting became synonymous." CBS, in response to the culture of blacklisting, instituted a "purge of its own," as had Hollywood and President Truman. Paley was more responsible for policy setting, and Stanton was its main executor. Radio producer William N. Robson was one victim of the CBS purge; initially reassured by Stanton that his listing in the anticommunist Red Channels pamphlet would not mean the end of his career with CBS, Robson eventually found the executive office of CBS nonresponsive to his inquiries, and his earnings collapsed. Good Night, and Good Luck, a 2005 film portraying this era, avoids mentioning Stanton, partly because Stanton was still living and could have objected to his portrayal. Stanton played a role in the infamous controversy involving Arthur Godfrey, CBS's top money-earner in the early 1950s. Godfrey insisted that the cast members of two of his three CBS shows, a group of singers known as the "Little Godfreys," refrain from hiring managers. When one singer, Julius LaRosa, hired a manager after a minor dispute with Godfrey, the star consulted with Stanton, who suggested that he fire the popular LaRosa, then a rising star, on