Big Pharma
They have a real problem, as their pipeline of new drugs is drying up.
My wife was in biotech, and the problem is that it is horrendously expensive to develop a new drug. With the limits of patent validity it means that the companies in reality have about 10 years to recover the investment (+ the cost of all this that went nowhere). It is also the reason no-one wants to find treatments for diseases that only affect a few or mainly poor people.
If you remove patents no sensible company would do any drug development, as others could copy from day 1. If this is good or bad I let you consider. My wife's company changed from drugs to food additives - it is much simpler to show that your stuff is harmless than to prove it is better that what is already there.