If you see a lot of referrals to your website from websites that deal with marketing or search engines. This is a type of spam that these websites add to your Google Analytics by sending fake requests with fake referral information.
I was finally able to get them blocked, but had a difficult time finding the correct method, so here’s step-by-step instructions:
1. Click ‘Admin’ at the top and ‘All Filters’ for your account:
2. Add a new filter for each site you would like to block:
3. In the filter, exclude traffic “to the hostname” of the site that is spamming you:
As you can see, I have a long list of sites blocked from mine:
Hope that helps! Post a comment if you have any more questions.