CRA can serve a request to pay (RTP or third party demand) on anyone who owes money to a tax debtor and the payments then have to be made directly to CRA.
"This article provides information of a general nature only. It is only current at the posting date. It is not updated and it may no longer be current. It does not provide legal advice nor can it or should it be relied upon. All tax situations are specific to their facts and will differ from the situations in the articles. If you have specific legal questions you should consult a lawyer."