In a coast-to-coast crackdown, the Securities and Exchange Commission has brought 23 actions against Internet fraud.

The suits, filed Tuesday and Wednesday in a handful of states, accuse 44 people and companies of artificially inflating stock prices and, in some cases, promptly dumping them for a profit. The violations of federal securities laws occurred in junk e-mail, on-line newsletters, message board postings, and on Web sites, the SEC said.

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