In 1975, after the withdrawal of US troops Communist authorities re-united the country by military force and claimed that the religious activities of Roman Catholics were stabilized and that there was no religious persecution. Meanwhile, the Government acted to isolate and neutralize hard-core opposition within local Catholics to party policy and to persuade less strongly opposed factions to join a party-controlled "renovation and reconciliation" movement. A significant number of Vietnamese Roman Catholics, however, remained opposed to communist authority. Since Đổi mới reforms, the Vietnamese government alternates its treatment of Roman Catholics.