Who was spying on Karol Wojtyla?

In 1949, the future Pope was a misspelled name in the reports sent to the secret police by a turncoat priest in the Krakow curia. But they would get to know him very well over the next forty years, until the death of the regime, while his life was bugged, filmed, followed, and analysed "24/7". "Zagielowski", who wrote a report in which "Wojdyla" was pointed out as someone to keep an eye on, was recruited in 1948 and would be active until his death in 1967 - Gigi Riva

Who was spying on Karol Wojtyla?