Shadowrun: The Icarus Effect
The pertinant info is this:
The investigation of the assassination of President Elect Boyd showed that the assassins were supplied by Renraku owned Private Military Company Archangel Incorporated which was found to be operated by the UCAS controlled CIA. While Renraku quickly renounced and disbanded the PMC the damage was done. Having lost 11.4 Trillion Nuyen in various contracts Renraku pulled out of the CAS.