Does a Document Link Show Coordination Between Mercer Family and Brexit?
If so, such collusion is unlawful in the United Kingdom
The Guardian and other outlets have drawn a connexion between the Brexit campaign, Cambridge Analytica, Nigel Farage, and the recent US Election (calling the Brexit campaign the test bed for the US 2016 election).
The Guardian goes into a detailed analysis of the financial connexions between the Mercer family and the Brexit campaign. The Mercers deny the allegations in a response in the article.
The article is very long, but worth reading. (The kind of news analysis you don’t see in US newspapers.)