In March 2023, civilians accompanied by Oaxaca state police attacked the Union of Indigenous Communities of the Northern Zone of the Isthmus (Ucizoni) encampment, where indigenous Ayuuk community members had been peacefully blocking the Mogoñe Viejo-Vixidu railway line for 24 days. Following the attack, 11 members of the community were informed that they were being investigated for the crime of "attacks against federal communication routes". On 28 April, 6 community members, Maria Magdalena Martinez Isabel, Esperanza Martinez Isabel, Elizabeth Martinez Isabel, Eliodoro Martinez Isabel, Fernando Hernández Gomez y Adela Severo Teodoro, were arrested.

This blockade is one of Ucizoni's forms of resistance against the project to build the Mogoñe Viejo-Vixidu section of the Isthmus of Tehuantepec railway, part of the Inter-Oceanic Corridor of the Isthmus of Tehuantepec (CIIT), with the participation of Ferrocarril del Istmo de Tehuantepec S.A. de C.V., a majority State-owned company, on indigenous territories without their free, prior and informed consent. This project also includes the development of a commercial-industrial corridor between the Gulf of Mexico and the Pacific Ocean, the construction of commercial ports, a network of primary and secondary roads, digital connectivity networks, a gas pipeline, as well as ten industrial parks. The project also plans to connect with another large-scale investment project, the "Tren Maya". These projects pose a risk to the livelihoods of the 12 indigenous communities living in the area, as well as to the preservation of their territory and environment.