From Zenit.org:

A foundation that promotes interreligious dialogue announced that it has more than 2,300 pages of original documents illustrating Pope Pius XII’s efforts to help Jews in the face of Nazism.

The president, himself a Jew, reported that these papers, found through the organization’s private research, give “strong support to the argument that Pope Pius XII — Eugenio Pacelli — worked diligently to save Jews from Nazi tyranny.”

And, from another Zenit.org article:

The director of the Vatican’s semi-official daily newspaper L’Osservatore Romano contends that the Black Legend surrounding Pope Pius XII and Nazism has two causes: Communist propaganda and division within the Church.

Vian contended that there were also those within the Church who promoted the discrediting of Pius XII because of the division between “progressives” and “conservatives” that developed during and after the Second Vatican Council.

Vian suggested that with division in the Church beginning in the 1960s, those who opposed conservatives attacked Pius XII — who was presented as their symbol — fostering and using the arguments of the black legend.

And, from Deacon Sciolino’s presentation for Morris Wortman’s Holocaust Study Group:

One can only speculate how many more Christians might have acted heroically before or during the Holocaust if Pius, as the Vicar of Christ, had modeled ethical behavior fearlessly in the prophetic tradition.