Multi User

<Where>
    <Eq>
         <FieldRef Name='Management' LookupId='TRUE' />
         <Value Type='UserMulti'>{0}</Value>
    </Eq>
</Where>

User Or Group

<Or>
    <Eq>
        <FieldRef Name='Respondents' LookupId='TRUE' />
        <Value Type='UserMulti'>{1}</Value>
    </Eq>
    <Membership Type='CurrentUserGroups'>
         <FieldRef Name='Respondents' />
    </Membership>
</Or>