If you have no evidence then why in the world would you make a claim such as this? Besides that if what you call "underhanded tactics" were used, were they illegal? Here's a heads up for you. No business ever became successful by being the nice guy when it came to the competition. Running a successful business is a fight to the death on a daily basis.
You are right in your post with the other things you said as well.
Still, I know because I worked for a company affiliated with that company. Distribution stuff. That particular company was wrecked from the inside, and I know a lot of people who saw it first hand.
It was outrageous.
I happen to know a lot of things that I cannot prove. But we are simply chatting here after all.