The word hartaban is the imperfect form of hartar in the third person plural.
See the full hartar conjugation

hartar

Las regañinas de mi jefe me hartaban, así que me puse a buscar otro trabajo.
My boss's nagging was wearying me, so I started looking for another job.
Los periódicos se hartaban de cubrir de insultos a los bolcheviques. Su padre estaba en la cárcel. Decididamente, la revolución había frustrado sus esperanzas.
The newspapers were denouncing the Bolsheviks, their father was in prison–the revolution was definitely disappointing.
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