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News Analysis: In its most aggressive position against Google yet, Consumer Watchdog April 21 asked the U.S. Department of Justice to sue the search engine and suggested the government agency could break up Google into several companies.

Consumer Watchdog advocate John M. Simpson argued that the government must go beyond opposing Google’s attempts to grow its search and advertising businesses with services such as Google Book Search and by subjecting Google’s $750 million bid for mobile ad provider AdMob to intense scrutiny.