YES. DO NOT BRING YOUR POCKET KNIFE THROUGH SECURITY. They will force you to throw it out, or send you back to deal with it yourself. If you are caught with a knife beyond the security checkpoint, it will be confiscated and you might be charged with a crime.
There is some confusion on the subject, because there was a brief time early in the decade when the TSA did allow small knives on planes, but that didn’t last long.
You can read more about TSA’s Decision to Not Allow Knives on Planes at FORBES.