Stanley Forman Reed,
Partmar Corp. v. Paramount Pictures Theatres Corp…
“ The issue of conspiracy was not litigated; nor did petitioner have a fair opportunity to litigate the issue. Indeed, whether petitioner had an opportunity to do so is immaterial under the doctrine of collateral estoppel. If the counterclaims had been based on the same cause of action as the eviction suit, such an opportunity might have barred petitioner under the more sweeping doctrine of res judicata. But here, where the second suit is based on a different cause of action, a neglected opportunity in the first action to litigate an issue is without legal significance. ”
