Mick Cash, the RMT's senior assistant general secretary, said Mr Crow's death had rocked the trade union movement, both in this country and around the world.
The thousands of messages of condolence from every part of the globe are a testament to the courage, leadership and strength that Bob shared with so many people.
Whilst Bob Crow's funeral itself will be a strictly private affair, his friends and family recognise that many people will want to show their solidarity, respect and support, both on the day itself and on May Day. These arrangements give everyone a chance to play their part.
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Jeremy Zeid likened the president to Nazi war criminal Adolf Eichmann who was abducted by Israeli agents in 1960 and later hanged.
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The 33 year-old victim was cycling to the shops when he was the victim of the unprovoked attack by three men.