Nick Ansell/PA Wire
From MPs to journalists, economists to trade unionists, people on Twitter came out in tribute to RMT leader Bob Crow, within minutes of the news of his death.
Mr Crow is believed to have suffered a fatal heart attack in the early hours of Tuesday morning.
Those paying tribute included Labour MPs Tom Watson and John McDonnell, and Kevin Maguire, political editor of the Daily Mirror who knew the RMT leader well.
Many high-profile journalists and entertainment figures said they admired Crow's dedication to his cause.
Many paid tribute to a man dying at the age of 52, while maintaining they despised his politics, and the tube strikes he called.