If you own both companies, then no, its not illegal. If your work for a larger corporation and you don't disclose that you both work for the larger corporation and run the said cable making company, then yes its embezzlement. It's unfair competition, and it does violate a few legal statutes. http://en.wikipedia.org/wiki/Embezzlement

Unfortunately that's called embezzlement and it's sort-of highly illegal. Now for a privately owned company, you can create your own side business of making cables and bid the job for the cable creation and charge $250.00 when your competitor charges $300.00. You win the bid for being the lowest price and you then create the cable for $20 and make $230.00 in profit. That is NOT illegal. However for a publicly traded company, that too is unfortunately illegal.

It's muddier than that now. Because the 'shin-kickers' aren't throwing rocks and home-made Molotov cocktails. They have automatic assault rifles, RPG's, Mortars, IED's, etc... Take for instance the middle east. Religion A says spot X is the promised land and is theirs. Religion B says that they are infidels and that it's their holy land. Then you have the United States, which says that we should fix EVERYONE else problems except OUR OWN. If two of my neighbors get into a fight, I wouldn't care and I wouldn't get involved. If the fight found its way into my lawn, you bet your bottom dollar I'm getting involved. However, the US agrees with Religion A and gives aid to them. Religion B by proxy says that we too are infidels and says we should all die. This becomes one reason why 4 planes were hijacked on 9/11. Now, how do we end it? Do we go to Osama Bin Laden and say We're sorry and we'll leave you alone if you leave us alone? If it was that simple, don't you think we would of just done that?