Use information barriers to control information flow between internal groups of users in order to avoid inappropriate communication that could violate compliance.
Go to Information Barriers under Compliance in the left nav and then select the Group Management tab (Figure 1):
Figure 1 Group Management
From here, select Create an IB Group and assign users to the group by searching for them in the Membership window. Once you’ve set up your groups, you can activate a block policy between specific groups by selecting Policy Management and clicking Create IB Policy.