Gregorio Leti's Papal Nepotism, or the True Relation of the Reasons Which Impel the Popes to make their Nephews Powerful (1667) is one example of contemporary criticism of the institution of the cardinal-nephew; Leti holds the rare distinction of having all of his publications on the Index Librorum Prohibitorum ("List of Prohibited Books").
Papal Nepotism, or the True Relation of the Reasons Which Impel the Popes to make their Nephews Powerful (1667) karya Gregorio Leti merupakan salah satu contoh kritikan kontemporer tergadap institusi kardinal keponakan; Leti memiliki perbedaan langka dalam seluruh publikasinya pada Index Librorum Prohibitorum ("Daftar Buku Terlarang").