Tosefta su Gittin 5:11

The thief, and the robber, and one who forces [people to sell things against their will]: their terumah is [valid] terumah, and their tithes are [valid] tithes, and their consecrated produce is [valid] consecrated produce. [But] if the landowners were chasing after them [to reclaim the stolen produce], their terumah is not [valid] terumah, and their tithes are not [valid] tithes, and their consecrated produce is not [valid] consecrated produce. Landowners [whose land was purchased from] sicarii [assassins who ransomed property by threatening the life of the previous owner, see Y. Git. V.7.2)]: their terumah is [valid] terumah, and their tithes are [valid] tithes, and their consecrated produce is [valid] consecrated produce.