Leonard Leo has been publicly linked and reported in multiple sources to have ties to Opus Dei, a conservative Catholic organization headquartered in Rome that operates under the direct authority of the Vatican. While he has not publicly confirmed membership and no direct financial ties have been publicly documented, his devout Catholicism, professional networks, and alleged ties to Opus Dei-style Catholicism have led to widespread speculation and alleged affiliations suggesting a connection to this network of influential conservative Catholics. Opus Dei's influence in conservative legal and political circles aligns with Leo's own activities; the organization has historically funded conservative Catholic initiatives globally and has a history of influencing conservative political movements worldwide, with its members often holding influential positions in politics and law. While Opus Dei is not a foreign government, its operational alignment with the Holy See (a sovereign entity) and its role in coordinating global conservative activism raise concerns about indirect foreign influence from the Holy See. Leo's leadership in organizations with Catholic missions (e.g., Catholic Association) suggests potential ideological alignment with Opus Dei's goals, implying potential ideological and operational coordination with a transnational religious network that has historically advanced conservative judicial and political agendas.