I could probably just read one of the hundreds of articles posted about this subject but am not that interested. If no one wants to tell me because I am an anti foot ball fan, that's cool too.
http://www.attorneygeneral.gov/uploadedFiles/Press/Sandusky-Grand-Jury-Presentment.pdf
Grand jury report - WARNING GRAPHIC!
Briefly, then, he is accused of not doing enough when informed by a former player and current (at the time) graduate assistant coach that he had witnessed a terrible scene involving a little boy in one of the locker rooms on campus. There is some discrepancy about what Paterno was told, how much detail was given to him, but at the very least he knew that a grown man, one who Paterno had known and worked with for decades, was seen showering alone with a boy and that something of a sexual nature had occurred between them. He also knew that this man (Sandusky) ran an organization to help disadvantaged kids called Second Mile, thereby giving him access to who knows how many boys. And yet despite this knowledge it appears that Paterno was content to keep the matter in-house, so to speak, instead of turning it over directly to the police. Not only that, but apparently Sandusky continued to frequent the football facilities at Penn State, sometimes showing up at practices with a boy in tow.