Ed Miliband MP, Leader of the Labour Party, said:
“Bob Crow was a major figure in the labour movement and was loved and deeply respected by his members.
“I didn’t always agree with him politically but I always respected his tireless commitment to fighting for the men and women in his union. He did what he was elected to do, was not afraid of controversy and was always out supporting his members across the country.
"He was a passionate defender of and campaigner for safe, affordable public transport and was a lifelong anti-fascist activist.
“My thoughts are with his family, friends and colleagues in the RMT and wider union movement at this difficult time.”