NBC – Securities regulators are investigating Charles Schwab and Merrill Lynch over whether they are doing enough to police their clients’ identities, sources said, a sign a crackdown on money-laundering is expanding, two sources told Reuters on Wednesday. Specifically, the regulators are looking into whether the brokerages missed red flags that could indicate attempts to move money illicitly or to feed proceeds from illegal activities into the financial system, the sources said. The Securities and Exchange Commission is probing Charles Schwab and Merrill Lynch for violations of anti-money laundering rules that require the brokerages to know their customers, the sources…