Dealings between contractors and the government can get difficult and contentious. Yet it’s important to keep discussions from getting overly nasty or personal. It may be tempting at times, but it will cost you in the long run. That’s according to Tim Sullivan, a partner at the law firm Thompson Coburn and author of the blog, “A Government Contractor’s 10 Commandments.” On the Federal Drive with Tom Temin, he tackled the seventh commandment: Thou shall avoid hostilities. Even though there are processes for protests, disputes and appeals, a contractor should exercise caution and restraint when pursuing these avenues.