This week marks the first anniversary of the deadliest assault against journalists in U.S. history. On June 28, 2018, a gunman opened fire at the offices of the Capital Gazette in Annapolis, Maryland, killing five and injuring two.

These deaths are not isolated. Every year, hundreds of journalists are attacked, imprisoned and murdered around the world. Some are killed because of what they do.

The Washington Post’s Jamal Khashoggi and the Wall Street Journal’s Daniel Pearl are among the victims. Other tragedies have included the 2015 fatal shooting of reporter Alison Parker and cameraman Adam Ward of Roanoke, Virginia’s WDBJ TV and the 2001 anthrax death of photo-journalist Robert Stevens of The Sun newspaper in Boca Raton, Florida.

No matter the circumstances of their deaths, these journalists and their sacrifices deserve to be remembered. In a free society, a free press is a basic tenet. The Fourth Estate acts as both an expression and a guardian of liberty.

That’s why we are beginning a campaign to erect a monument to fallen journalists in Washington.

U.S. Sens. Ben Cardin, D-Maryland, and Rob Portman, R-Ohio, and U.S. Rep. Grace Napolitano, D-California, introduce legislation this week to establish the Fallen Journalists Memorial. The Fallen Journalists Memorial Foundation, under the auspices of the non-profit National Press Club Journalism Institute, will build support and plan for the design, construction, operation, maintenance and preservation of the memorial. Initial funding is being provided by the Annenberg Foundation and the Ferro Foundation.

This is a call to action.

David Dreier is chairman of Tribune Publishing and the Fallen Journalists Memorial Foundation fallenjournalists.org.