Gifford, M. (1999). Ice Breakers. Taken from http:///mike/poped/ on July 3, 2007.
Economics was the second Keynesian textbook in the United States, following the 1947 The Elements of Economics, by Lorie Tarshis . Like Tarshis's work, Economics was attacked by American conservatives (as part of the Second Red Scare , or McCarthyism ), universities that adopted it were subject to "conservative business pressuring", and Samuelson was accused of Communism . Nonetheless, Economics proved successful and remained widely adopted. The success of Samuelson's text, compared with Tarshis's, which was subject to more "virulen[t]" attacks, is attributed to various factors, notably Samuelson's dispassionate, scientific style, in contrast to Tarshis's more engaged style, and subsequent texts have followed Samuelson's style.  Accusations by conservatives of communist sympathies in Economics continued into the 1980s. 
However, such guides permit the comma to be omitted if the second independent clause is very short, typically when the second independent clause is an imperative ,   as in:
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