No. FISA and the two federal courts (the Foreign Intelligence Surveillance Court and the Foreign Intelligence Surveillance Court of Review) created under it in the 1970s do not make this surveillance possible, as it was possible before FISA; instead, they are part of the regime established to restrict it after a number of notorious abuses (the FISA restrictions have been weakened in the post-9/11 era, but are still more than existed prior to FISA.)