Wall Street giant Morgan Stanley has imposed individual fines of more than $1 million on some of its bankers for doing business on messaging applications in breach of record-keeping rules, according to a person familiar with the matter. The penalties are being issued months after Morgan Stanley and 10 other big banks [agreed to pay hefty fines](https://www.wsj.com/articles/wall-street-to-pay-1-8-billion-in-fines-over-traders-use-of-banned-messaging-apps-11664311392) levied by U.S. regulators ove