7:52 PM ET

The Golden State Warriors and Boston Celtics wore orange shirts with the message "End Gun Violence" on the front before the second game of the NBA finals.

Warriors coach Steve Kerr and Celtics coach Ime Udoka both wore t-shirts to their news conferences. Before Game 4 of the Western Conference finals in Dallas, Kerr made an angry plea for a change to gun laws after 19 children and two teachers were killed in a mass shooting at a Texas elementary school.

Kerr said that it's time for people to notice. To help limit the gun violence that is out there. There are ways to keep it under control. There are proven laws that are waiting to be passed.

There are things we can do that would save lives. The idea is to make people aware that they can contribute to different gun safety and gun violence prevention groups.

There is a message on the back of the shirts that says "LEARN MORE" with the social media handles of organizations that support gun control legislation.

Popovich took aim at government officials at the Stand with Uvalde gathering in San Antonio.

What number will it take? Popovich wanted to know. Is that a massacre every month? There have been two massacres a week. There are fifteen kids. There are 24 kids. Where will 74 be killed someday? Maybe you'll do something. Get off your butt. Do something to make a difference. We need them to work for us. They don't do anything about the gun laws because they care more about their power, their position and their money than they do our children.

Kerr urged people to get out and vote.

Kerr's father, Malcolm, was murdered in a terrorist attack in 1984 when he was president of the American University in Lebanon. Despite the fact that the majority of people in this country want gun safety measures put in place, a lot of congressional races are decided by people who don't really care about gun safety measures. If you feel strongly about saving lives, voting is a good way to do it.

It's the only way to convince the people we need to convince to start implementing gun safety regulation laws.

Udoka spoke out against gun violence.

If you win, Udoka said, you feel great about it. It's not life and death, you still go on, even though you're devastated for the moment. There are things happening in our communities that are not well known. We go on with our normal life and business even though they are devastated. Keeping those thoughts in mind will help those people.

It keeps happening. Awareness and changes are needed and we are all on the same page.