Mr. Link Deas is the employer of Tom Robinson, a coloured man who is convicted in charge of raping a white woman. He is one of the few people in Maycomb's white community who believes in Tom Robinson's account of events. He vouches for Tom's honesty and integrity in front of the whole court:
I just want the whole lot of you to know one thing right now. That boy's worked for me eight years an' I ain't had a peck o'trouble outta him. Not a speck.
Even after Tom's death Mr. Link Deas went out of his way to help his family to cope after his death. He employed Tom's wife Helen even though he did not particularly need her on his farm, but he did it to help her run the family. He openly declared in a racially hostile environment that he felt bad for her and the way circumstances had cruelly turned against her. When he realized that Helen was being persecuted and tormented by the Ewells who threw stuff at her, and forced her to avoid the public road and take a longer route to the farm, he walked her home and also threatened Ewell against persecuting Helen any further:
If I hear one more peep outta my girl Helen about not bein' able to walk this road I'll have you in jail before sundown!
So, in a way Mr. Link Deas takes the safety and security including financial security of the Robinsons under his wing.