they were blocked because it was an THREAT to your computer that can download viruses wihoutyou even knowing or interacing. (drive by download)
i dun suggest you visit them because kaspersky dont block websites without a reason!
The websites contains exploits/ malware/ (spyware/ viruses/ torjan horses) all the nasty stuff that you don’t want.
IF YOU WANT TO VISIT THE WEBSITE:
any way if you want to get your computer damaged click on kaspersky itnernet seucrity->go to anti malware then web traffic->click on the web traffic button that is green->click disable.
OR
you can go to settings -> under protection go to anti malware -> un check web protection
i hope you know what you are doing!