The person we're looking for indeed has the steam ID: STEAM_0:0:15584729 Anticx[MD]#VGLeague.

In the first video he indeed does have hacks but was claiming that it's not a hack and it's more like a powerup or something. He uses the speed hacks to dodge zombies. This happens at Sept 9, around 8:30 AM EST.

The second video is in a different map at 08:55:35 AM EST. Right in the beginning of this video, a player named "StopSign" says "i no how to crash a server for a week". So, I watch out for him. Then it continues on with the conversation about hacks with a couple of people. It shows Anticx[MD]#VGLeague speed hacking and such.

No doubt it is hacking and no doubt we need to get rid of another hacker in our server.

Good work, Tommy!