There was recent news from Albania that a gun running organization (supplying weapons to the Syrian war) with wahabist links had increased it's control in the famously violence infested corner of south-eastern Europe.
guess who was helping fund them? (and using which currency/payment network?). I expect you all need only one guess

If Janet Yellen has proof that Bitcoin funded terrorism, it's likely because her partners in crime at the CIA gave her the information, and they only know because
they provided all the guns and the Bitcoins for the deals with the terrorists