3. In itself, this act was one of disobedience to the Roman Pontiff in a very grave matter and of supreme importance for the unity of the church, such as is the ordination of bishops whereby the apostolic succession is sacramentally perpetuated. Hence such disobedience - which implies in practice the rejection of the Roman primacy - constitutes a schismatic act.(³) In performing such an act, notwithstanding the formal canonical warning sent to them by the Cardinal Prefect of the Congregation for Bishops on 17 June last, Mons. Lefebvre and the priests Bernard Fellay, Bernard Tissier de Mallerais, Richard Williamson and Alfonso de Galarreta, have incurred the grave penalty of excommunication envisaged by ecclesiastical law.(⁴)