GROZNY, Russia — They never go out alone, and when they are in their small apartment here in the capital of Chechnya, a flat screen on the wall displays a continuous feed from security cameras in the hall and stairway outside.

When the three men squeeze into their little car, they can activate a video camera and microphone in case of trouble and push a small red button on their dashboard to transmit sound directly to their main office 900 miles away.

“It’s an internal rule,” said Vladislav Sadykov, 46, a lawyer who leads the group. “We always travel together. If you are alone, it is easier to kidnap and torture you. The pictures are for protection, and also in case they kill us it will be recorded.”

The three men make up the current shift in a rotation of visiting human rights investigators called the Joint Mobile Group, which has taken on kidnapping and torture cases in this Russian republic that it considers too dangerous for resident human rights workers to handle.