The Bitcoin lead maintainer and co-maintainers have merge access (i.e. they can approve changes to Bitcoin source code). We can see who the maintainers were since 2014:
https://github.com/bitcoin/bitcoin/blob/master/contrib/verify-commits/trusted-keys
- Is this a complete/accurate list of maintainers since 2014?
- Is there a list of when maintainers had merge access before 2014?