The Texas Ranger Division, also known as the Texas Rangers and nicknamed the Diablos Tejanos (Spanish for 'Texan Devils'), is an investigative law enforcement agency with statewide jurisdiction in the U.S. state of Texas, based in the capital city Austin. The Texas Rangers have investigated crimes ranging from murder to political corruption, acted in riot control and as detectives, protected the governor of Texas, tracked down fugitives, served as a security force at important state locations, including the Alamo, and functioned as a paramilitary force at the service of both the Republic (1836–1846) and the State of Texas. Today they also conduct cybercrime investigations, cold case reviews, public corruption probes, and provide tactical support in major emergencies.
The Texas Rangers were unofficially created by Stephen F. Austin in a call-to-arms written in 1823. After a decade, on August 10, 1835, Daniel Parker introduced a resolution to the Permanent Council creating a body of rangers to protect the Mexican border. The unit was dissolved by the federal authorities after the Civil War during the Reconstruction Era but was quickly reformed upon the reinstitution of home government. Since 1935, the organization has been a division of the Texas Department of Public Safety (TxDPS); it fulfills the role of Texas' state bureau of investigation. As of 2019, there are 166 commissioned members of the Ranger force.