That would be during the era of Perestroika. It's arguable if he was acting against communism or against Gorbachev's version of communism.
Which specific organizations he funded did you have in mind?
I googled “soros fax machines” and found a bunch of stuff, including his own foundation and others. Remember, this was pre-internet.
I tend to believe his dislike for communism was real. That doesn’t mean he’s right in all of his views.