Say you have a co-worker. They're from another country, clearly. But your company hired them, they've been a model employee for years. That they got hired means they passed a background check at the very least.
One day they ask you to help them send money to a relative back home. Seems that they are not able to provide a phone number or other required identifying information. This seems strange to you, but again, your company hired them, so maybe it's a fluke.
After a few months the co-worker doesn't show up to work. Can't be located. Have no idea where they went or why. Shortly after, your manager calls you in to tell you that the person was deported; it seems they were not allowed to be in the country and actually were a criminal on the run.
Under current law, ignorance is your excuse. The company hired them in good faith, you trusted them with money in good faith, you had no way to know what the person's deal was.
Under this new law, the NSA would already have been aware of criminals on the run from spying on foreign countries. They would have then traced and collected whatever evidence against those criminals in order to take action. Sounds great right?
The road to hell is paved with good intentions, because they would likely consider the fact that you gave them money and helped them transmit it back to their home country as aiding and abetting a criminal, money laundering, etc. A bunch of assumptive, trumped up charges, based solely on the fact that you communicated with this person. Since the law allows them unfettered access to the communication, they wouldn't waste time with good faith arguments. They'd just build a case against you and arrest you.
It doesn't matter if you later get cleared. The fact that you were arrested and charged means hundreds of thousands of dollars with attorney fees, months of wasted time fighting the charges, the loss of a job, a criminal record, etc. These are irreversible damages, and once the smoke clears, the government still won't accept that it was wrong.
It gets worse. Say you do get cleared. This law as written allows them to bypass double jeopardy; in other words, they still can charge you with something else that they didn't charge you with before, based on the same communications.
It's a slippery slope.