Observers and lawmakers see the NRA as one of the three most influential lobbying groups in Washington, D. C. The NRA Institute for Legislative Action (NRA-ILA) is its lobbying division, which manages its political action committee (PAC), the Political Victory Fund (PVF). Over its history the organization has influenced legislation, participated in or initiated lawsuits, and endorsed or opposed various candidates at local, state, and federal levels. Some notable lobbying efforts by the NRA-ILA are the Firearm Owners Protection Act, which lessened restrictions of the Gun Control Act of 1968, and the Dickey Amendment, which blocks the CDC from using federal funds to advocate for gun control. The NRA has been criticized by gun control and gun rights advocacy groups, political commentators, and politicians. The organization has been the focus of intense criticism in the aftermath of high-profile shootings, such as the Stoneman Douglas High School shooting and the Sandy Hook Elementary School shooting, after which they suggested adding armed security guards to schools.