Mexico City—In the early evening of September 26, in the final installment of a seven-day series of protests under the heading “10 Years of Impunity,” the families of the 43 forcibly disappeared students of the Ayotzinapa Rural Teachers’ College testified before a crowd in front of the National Palace. The rain from Hurricane John, which was battering their homes in the southeastern state of Guerrero, had reached the national capital, falling cold and heavy on people who chanted, “It was the army!” and “It was the state!”

The families of the young men had marched through the city to the Palace, the president’s official residence, accompanied by thousands of supporters, many of whom are also missing family members. Heavy metal barricades ringed the grand building, keeping the protesters at a distance from its façade. That morning, outgoing President Andrés Manuel López Obrador (AMLO), once a trusted ally of the Ayotzinapa parents, had said the barricades were necessary to protect against damage to the Palace by bad actors.

The facts of the Ayotzinapa case to date are that on the night of September 26, 2014, and into the next morning, municipal, state, and federal police officers, along with soldiers from the Mexican Army and members of the Guerreros Unidos organized criminal network, attacked six buses in the city of Iguala. Five of the buses had been temporarily commandeered by students of the all-male teachers’ college for their journey to Mexico City to commemorate the October 2 anniversary of the 1968 Tlatelolco massacre. The rationale behind the Iguala attack is disputed, but independent investigators allege that the police may have been attempting to protect a haul of heroin stashed on one of the commandeered buses and bound for sale in the United States.

The remains of only three students have been identified, and the fate of the other 43 is still unknown. The Mexican Army, which documented the attack in real time, has information about where they are. The Secretariat of National Defense (SEDENA), which oversees the army, refuses to hand over 800 folios of information that the international group of expert jurors appointed by the Inter-American Commission on Human Rights has requested. AMLO’s government, as well as that of his predecessor Enrique Peña Nieto, have both protected SEDENA against having to do so. No convictions have been made.

“Obrador betrayed the trust that we as parents placed in him and turned his back on the Ayotzinapa case by protecting the Army,” said Hilda Legideño, mother of Jorge Antonio Tizapa Legideño, when she took the microphone in front of the crowd in Mexico City.

“He will go down as an accomplice of those people who disappeared our children.”

In 2014, as news of the case broke around the country, Ayotzinapa quickly became an emblem of both the crisis of forced disappearances in Mexico and the collective struggle against them. The parents of the 43 rallied those who have suffered the disappearance of a child or relative and catalyzed the formation of the first National Search Brigades of family members who seek remains of the disappeared in clandestine gravesites. The Ayotzinapa school is one of Mexico’s socialist escuelas normales rurales, community-based, politically cohesive systems of education and formation whose solidarity and organization is reflected in the coordinated searches for the disappeared.

Taking the microphone after Legideño, Mario González, father of César Manuel González Hernández, addressed AMLO directly, calling him a “vulture,” saying, “You put yourself at the feet of the army that you’re so proud of…. You turned your back on all of us fathers and mothers whose children were disappeared by the state.”

The visceral denunciations by many parents of the disappeared students make their position clear: They have been played by AMLO, who had made their case the “central human rights commitment of his government,” as former special prosecutor Omar Gómez Trejo wrote last week in El Faro. They trusted that the president and his officials would deliver to them the truth of what happened to their children and seek restitution for their violent kidnapping. Despite the government’s constant backsliding and attempts from multiple actors to divide their united front, the parents continued to work with the government. Up until August of this year, they attended meetings with officials in Mexico City and posed for photo ops with AMLO as the perpetrators were arrested and released from prison, or, in the case of former security chief Tomas Zerón, fled to Israel to evade arrest.

“Expectations were raised that in this government justice could be obtained, that it would be possible to know what happened,” lawyer and spokesperson for the families Vidulfo Rosales told local media in the lead-up to the anniversary. After “a lot of optimism” among the parents, as AMLO’s term ends they have been left with “disappointment and despair.”