The Index of Forbidden Books was a part of the Catholic church's efforts to start a what

The 1948 edition of Index Librorum Prohibitorum is included in the "Beacon for Freedom of Expression" data base. The first edition of Index Librorum Prohibitorum was published in 1559, and subsequently published in 19 editions by different popes through the centuries. The last edition was published in 1948, only to be suppressed in 1966.