Considering that FISA was passed in 1978 and that the NSA has been around since the 1950s, I would assume that domestic wiretapping has been going on the entire

Considering that FISA was passed in 1978 and that the NSA has been around since the 1950s, I would assume that domestic wiretapping has been going on the entire time. They absolutely have to say publicly that they are not recording any US citizens data, but year after year there are leaks that say otherwise. Maybe 98% of NSA employees were required to not intercept any US citizen transmissions but there has likely always been a division of the NSA that is devoted to domestic spying. The agency would be completely ineffective if they didn't allow recording domestic communications.