violate Google Webmaster Guidelines.”
Here is a screenshot of the applied manual spam action penalty:
What To Do Next After You Have Received a Penalty?
All those site owners who have received such messages in the webmasters console must first try and detect all such low quality outbound links on their site then they must either remove them completely or no-follow them. At last, submit a reconsideration request to Google.
How to Find Out All the Outbound Links on Your Site?
Download the screaming frog software from here. Run it and this will display all the outbound links your site is having. Identify all the low quality ones that can initiate Google penalty and no-follow them or remove them.
Also See:
Checking Whether Your Site is Manually Penalized by Google
How to Write a Reconsideration Request?
Why Paid Links Are a Violation of Webmaster Guidelines
Google Disavow Links Tool
Link Farms
Link Churning
Penguin 2.0 Recovery Guide
What Exactly is a High Quality Backlink?