Cahill Gordon & Reindel is defending Credit Suisse Group in a securities class action suit related to the financial services firm’s alleged work with Russian oligarchs facing sanctions, according to documents filed Thursday in the Eastern District of New York.

Cahill litigation department chair Herbert Washer, partner Sheila Ramesh and counsel Adam Mintz are representing Credit Suisse, CEO Thomas Gottstein and CFO David Mathers in the suit, which was filed April 29 by Pomerantz LLP managing partner Jeremy Lieberman and associate Thomas Przybylowski.