Public officials from Congress to City Hall are now regularly subjected to threats of violence. It’s changing how they do their jobs.

There is little research on the political views of those behind the onslaught of abuse. Some surveys show that Republican officeholders are more likely to report being targeted, often from members of their own party. Research does show, however, that recent acts of political violence are more likely to be carried out by perpetrators aligned with right-wing causes and beliefs.