BAGHDAD — Rekindling sectarian rivalries at a sensitive time, Iraq’s Parliament Saturday voted to fully legalize state-sanctioned Shi’ite militias long accused of abuses against minority Sunnis, adopting a legislation that promoted them to a government force empowered to ‘‘deter’’ security and terror threats facing the country, like the Islamic State group.
The legislation, supported by 208 of the chamber’s 327 members, was quickly rejected by Sunni Arab politicians and lawmakers as proof of the ‘‘dictatorship’’ of the country’s Shi’ite majority and evidence of its failure to honor promises of inclusion.
‘‘The majority does not have the right to determine the fate of everyone else,’’ Osama al-Nujaifi, one of Iraq’s three vice presidents and a senior Sunni politician, told reporters after the vote, which was boycotted by many Sunni lawmakers.
‘‘There should be genuine political inclusion. This law must be revised.’’
Another Sunni politician, legislator Ahmed al-Masary, said the law cast doubt on the participation in the political process by all of Iraq’s religious and ethnic factions.
‘‘The legislation aborts nation building,’’ he said, adding it would pave the way for a dangerous parallel to the military and police.
A spokesman for one of the larger Shi’ite militias welcomed the legislation as a well-deserved victory. ‘‘Those who reject it are engaging in political bargaining,’’ Jaafar al-Husseini of the Hezbollah Brigades said.
‘‘It is not the Sunnis who reject the law, it is the Sunni politicians following foreign agendas,’’ Shi’ite lawmaker Mohammed Saadoun said.
The law, tabled by Parliament’s largest Shi’ite bloc, applies to the Shi’ite militias fighting the Islamic State as well as the much smaller and weaker anti-Islamic State Sunni Arab groups. Militias set up by tiny minorities, like Christians and Turkmen, to fight the Islamic State are also covered.
According to a text released by Parliament, the militias have now become an ‘‘independent’’ force that is part of the armed forces and report to the prime minister, who is also the commander in chief.
The new force would be subject to military regulations, except for age and education requirements — provisions designed to prevent the exclusion of the elderly and uneducated Iraqis who joined the militias. The militiamen would benefit from salaries and pensions identical to those of the military and police but are required to sever all links to political parties and refrain from political activism.
The legislation came at a critical stage in Iraq’s two-year-long fight against the Islamic State, a conflict underscored by heavy sectarian tensions given that the group follows an extremist interpretation of Sunni Islam and the security forces are predominantly Shi’ite. The Shi’ite-led government last month launched a massive campaign to dislodge the Islamic State from predominantly Sunni Mosul, Iraq’s second-largest city and the last major urban center still held by the extremist group.
Through the military, the government has used the campaign to project an image of even-handedness, reaching out to the city’s residents and promising them a life free of the atrocities and excesses committed by the Islamic State. It has also excluded the Shi’ite militias from the battle, winning a measure of goodwill from the Sunnis. But Saturday’s legislation might stoke the simmering doubts of many Sunnis about the intentions of the government.
The Shi’ite militias, most of which are backed by Iran, have been bankrolled and equipped by the government since shortly after the Islamic State swept across much of northern and western Iraq two years ago. Many of them existed long before the Islamic State emerged, fighting American troops in major street battles during the US military presence in Iraq between 2003 and 2011. Their ranks, however, significantly swelled after Iraq’s top Shi’ite cleric, Grand Ayatollah Ali al-Sistani, called for jihad, or holy struggle, against the Islamic State in June 2014.
They now number more than 100,000 men and fight with heavy weaponry, including tanks, artillery, and rocket launchers. The larger militias have intelligence agencies and run their own jails. Since 2014, they have played a key role in the fight against the Islamic State, checking its advance on Baghdad and the Shi’ite holy cities of Samarra and Karbala and later driving the militants from areas to the south, northeast, and north of Baghdad.
Their heavy battlefield involvement followed the collapse of security forces in the face of the 2014 Islamic State blitz, but their role has somewhat diminished in recent months as more and more of Iraq’s military units regained their strength and chose to distance themselves from the occasionally unruly militiamen.
Iraq’s Sunni Arabs and rights groups have long complained that the militiamen have been involved in extrajudicial killings, abuse, and the theft or destruction of property in Sunni areas. They viewed them as the Trojan Horse of Shi’ite, non-Arab Iran because of their close links to Tehran and their reliance on military advisers from Iran and Lebanon’s Hezbollah.
Many in the Sunni Arab community wanted them integrated into the military and police, a proposition long rejected by Shi’ite militia leaders, some of whom have on occasion spoken of their aspiration of evolving into a force akin to Iran’s Revolutionary Guards or the Iranian-backed Hezbollah — both well-armed military groups with substantial political leverage and large economic interests.
Senior Shi’ite politician Amar al-Hakim sought to reassure Sunnis on Saturday, saying several laws to be issued by the prime minister to regulate the work of the militias would allay many of their fears. He did not elaborate, but added, ‘‘The law creates a suitable climate for national unity.’’
In a statement, Prime Minister Haider al-Abadi welcomed the legislation and said the ‘‘Popular Mobilization Forces’’ — the formal name of the militias — would cover all Iraqi sects.
‘‘We must show gratitude for the sacrifices offered by those heroic fighters, young and elderly. It is the least we can offer them,’’ the statement said. ‘‘The Popular Mobilization will represent and defend all Iraqis wherever they are.’’
But Sunni lawmaker Mohammed al-Karbooly said the law ignored pleas by Sunni politicians for the expulsion and prosecution of Shi’ite militiamen accused of abuses.
‘‘The law, as is, provides them with a cover,’’ he said.
