In 2013, documents leaked by the former NSA contractor Edward Snowden revealed the existence of numerous surveillance programs jointly operated by the Five Eyes. The following list includes several notable examples reported in the media:
PRISM – Operated by the NSA together with the GCHQ and the ASD
XKeyscore – Operated by the NSA with contributions from the ASD and the GCSB
Tempora – Operated by the GCHQ with contributions from the NSA
MUSCULAR – Operated by the GCHQ and the NSA
STATEROOM – Operated by the ASD, CIA, CSE, GCHQ, and NSA
Interesting, isn’t it?