RMT president stands for Greens

The RMT transport union has donated £7,000 to the Green Party, and its president, Peter Pinkney, is standing as a Green candidate in the general election. He will contest Redcar, a constituency won by the Liberal Democrats at the last election.

http://greenparty.org.uk/news/2015/02/08/top-union-official-to-stand-for-greens-at-general-election/