Wakefield-Cady is Pearson Harden's biggest rival firm on 'Suits' (Thursdays, 10PM USA). So anyone leaking information about Pearson Harden's business to Wakefield-Cady could expect to be dealt with harshly, when it's being handed down by Louis Litt.
Unfortunately for Rachel Zane, it was Litt who found her confidential employee code on information faxed from Pearson Harden to Wakefield-Cady, and he promptly suspended her. Mike Ross was suspicious, and started snooping around to see if someone might have stolen an employee's confidential code. He found someone at the firm had been asked for a certain employee's number the week prior to the trouble.