More recently the "Pizzagate" thing is always associated with the one convenient headcase with his assault rifle and all the rest of it got swept under the carpet. Some of the Franklin testimony talked about a ring based in DC with connections to the Dems.
Here's a link to the cancelled YTV documentary on Franklin.
and a link to a "True or not?" thread with lots of links:
Also don't forget the Marc Dutroux case which had similar accusations and if anything an even larger potential scandal.
It is Wiki so very slanted but the "Deaths of potential witnesses" section is hard to ignore (More than 20 potential witnesses in the case have died in mysterious circumstances.).