Working for a company that deals with another that sells alcohol

Selling
alcohol is haraam, because Allaah says (interpretation of the meaning): 

“O you who
believe! Intoxicants (all kinds of alcoholic drinks), and gambling, and
Al‑Ansaab (stone altars for sacrifices to idols etc), and Al‑Azlaam (arrows
for seeking luck or decision) are an abomination of Shaytaan’s (Satan’s)
handiwork. So avoid (strictly all) that (abomination) in order that you may
be successful.

91. Shaytaan
(Satan) wants only to excite enmity and hatred between you with intoxicants
(alcoholic drinks) and gambling, and hinder you from the remembrance of
Allaah and from As‑Salaah (the prayer). So, will you not then abstain?”

[al-Maa’idah
5:90-91] 

And
al-Bukhaari (22360 and Muslim 91581) narrated from Jaabir ibn ‘Abd-Allaah
(may Allaah be pleased with him) that he heard the Messenger of Allaah
(peace and blessings of Allaah be upon him) say: Allaah and His Messenger
have forbidden the sale of alcohol.” 

Al-Tirmidhi
(1295) and Ibn Majaah (3381) narrated that Anas ibn Maalik (may Allaah be
pleased with him) said: The Messenger of Allaah
(peace and blessings of Allaah be upon him) cursed ten with regard to
wine: the one who squeezes (the grapes etc), the one who asks for it to be
squeezed, the one who drinks it, the one
who carries it, the one to whom it is carried, the one who pours it, the one
who sells it and consumes its price, the one who buys it and the one for
whom it is bought.

Classed as
saheeh by al-Albaani in Irwa’ al-Ghaleel (2385). 

With regard to
the company that deals with one that deals in alcohol, if they help in that
trade then undoubtedly they are doing something haraam and have a share of
the sin, and it is not permissible for anyone to do any work that is
connected to that. But if their interaction with those who deal in alcohol
has nothing to do with the alcohol and is not helping with it, rather it has
to do with other work that is permissible, then it is permitted to work with
this company with regard to permissible work that does not help with haraam
things. 

See also the
answer to question no. 48005. 

And Allaah
knows best.