The International League for Apostolic Faith and Order (ILAFO) was an ecumenical body founded in 1951 as a grouping of Old Catholic, Anglican and Lutheran churches. It included Orthodox Christian, Reformed and (from 1966) Roman Catholic members. The American Church Union worked in cooperation with the ILAFO. The ILAFO's Roman Catholic associates included Johannes Willebrands.
In 1967, the ILAFO reconstituted itself at a conference in Fribourg as the International Ecumenical Fellowship.
References
International League for Apostolic Faith and Order Wikipedia(Text) CC BY-SA