Labour leader Ed Miliband has said he wants union members to have an "active choice" over their membership to his party.
He told the BBC's Andrew Marr Show that he wants Labour to establish links to "individual union members".
He added that there needed to be a strong message sent about MPs with possible conflicting business interests.
More top news
Two men seen as alternative voices to the US political establishment have won decisive victories in the New Hampshire presidential primary.
Takeaway food and alcohol are causing a growing obesity crisis among pets, according to a leading animal welfare charity.
Teacher shortages in England continue to grow and the government has missed recruitment targets, the National Audit Office says.