perfected lien

The tenant was divested of neither title nor possession by the silent existence of the landlord's statutory lien on the date of the assignment. Only after the lien was actually asserted and an attachment or a distraint levied, enabling the landlord to satisfy his claim out of the seized goods, could it be argued that such goods severed themselves from the general and free assets of the tenant from which the claims of the United States were entitled to priority of payment.