MI6
Just put this into the Document Thread; posting here for more visibility:
Interview Transcript of Christopher Wylie (April 25, 2018)
http://docs.house.gov/meetings/IG/IG00/CPRT-116-IG00-D084.pdf
Page 163
REP. SCHIFF: Well, let me ask it this way then. Are you aware of use of Proton accounts to hide things that were unethical and potentially unlawful?
MR. WYLIE: I'm aware of people at Cambridge Analytica or SCL Group using technologies like ProtonMail or simply going and deleting things that may have been potential evidence that would have been relevant to an investigation.
REP. SCHIFF: Would you rather provide that to us in documentary form?
MR. WYLIE: Yes.