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All Twitter users on the web can now take out followers they don't want following them. The feature was first being tested out last month, but it's now accessible to all users. This is part of Twitter's efforts to help reduce harassment on its platform. Blocking someone might incite retaliation, but cutting them out without them knowing might be easier for you.
Of course, this won't keep them from seeing your public tweets. If you want to use this feature, head to your Followers tab on your profile. Click on the three-dot menu next to the user in question and select the "Remove this follower" option.
Source: Engadget