INTELThe Federal Trade Commission is investigating the top supplier of PC chips, and Justice may collaborate. The EU, Japan, and South Korea have fined Intel for anticompetitive behavior.

GOOGLEThe company's dominant position in online search is likely to draw more scrutiny as it expands into services such as Web video.

AT&T AND VERIZONJustice Dept. lawyers are looking at several things, including exclusive handset deals.

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