NY to Sue Some Insurers for Manipulation  NEW YORK (Reuters) - New York Attorney General Eliot  Spitzer is launching a suit against several prominent  participants in the insurance industry, including AIG and  broker Marsh   McLennan Cos. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MMC.N target=/stocks/quickinfo/fullquote"&gt;MMC.N&lt;/A&gt;, charging they engaged in  market manipulation, Spitzer's office said.