Does anyone recall the House Banking scandal? Something like 120 representatives were being investigated (about 15 were republican). There was only 1 trial, Dan Rostenkowski (D), and he was convicted.
Why no more? When Bill Clinton took office he, through Janet Reno, took the resignations of all the DOJ attorneys and retained none of them (unheard of!) Where did all those investigations go? Disappeared! No more records or files.
The House Banking Scandal was in 1992 and there were 6 congressmen and staff convicted. Rostenkowski was caught up in the post office scandal three years later.