on the FISA warrant applications
My guess is that if the WH was involved, that Obama wouldn't have signed any of these applications himself, of course. But Susan Rice and Samatha Power do come to mind They were unmasking people to get the names, which means they were in on the plan to destroy Trump. But I don't think they had the authority to sign applications to the FISA court.
These folks are in the public records for signing FISA warrants so far that I know of:
Loretta Lynch. Attorney General Lynch Signed Off on ALL FISA Applications to WireTap Trump
James Comey, Andrew McCabe, Sally Yates, Dana Boente, Rod Rosenstein. James Comey Signed FISA Applications