Half-Life Science & Industry Mod

From Sierra Entertainment:

The Science & Industry mod puts you in the role of a security officer in one of two rival research and development firms. Science and Industry is a team-play mod for Half-Life, in which players assume the role of Security Officer in one of two rival corporations striving for domination in the cutthroat world of chemical and weapons research and development. As security officer, it is your job to acquire and protect your company's most valuable human resources - scientists. Scientists conduct research and develop new products, bringing your company profit.

Conveniently, the products your company's scientists develop take the form of new weapons that you and your fellow security officers can use to pound the other company into submission. Stealing scientists from your rivals is a great way to boost productivity and keep those new weapons coming, but of course your competition has the same tactics in mind. So defending your company's scientists is just as important as 'finding' new ones.