Tainted Money?

QUESTION: Is  it a sin to let or sell a residence to a brewer or a cigar manufacturer or to one of their employees?

ANSWER:  It would be a good opportunity to show your disapproval by letting or selling your house at a sacrifice to some other person. But for me to say it is a sin to do otherwise, I am not prepared; for some one might raise the question whether the grocer would not sin in taking "tainted money" from the landlord, who has let or sold his house to a brewer or cigar-maker; and then whether it would not be wrong for the physician or minister to receive such money from the grocer, etc. etc., like "the house that Jack built." Human interests are so interlaced that there is no end to a boycott when once begun.

— Steele's Answers p. 221.