Plea Due in MedImmune Fraud Case Former Medimmune executive Eric Tsao is expected to plead guilty Friday to securities fraud, a case legal experts say is the latest in a series against high-profile defendants who allegedly try to subvert investigations. &lt;br&gt;&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;