RMT General secretary Bob Crow said: "One of the first things fascist dictators like Hitler, Mussolini and Pinochet did when they seized power was to ban transport workers from taking strike action so the Tory group on the London Assembly find themselves in some high profile company on this one.
"This crowd have obviously over-dosed on their post-Thatcher adulation and are looking to ramp up the anti-union rhetoric in advance of the publicly financed funeral on Wednesday.
"Of course, banning the fundamental human right to withdraw your labour, a right that distinguishes a free workforce from forced labour, is all the rage on the far right and anyone stupid enough to try and embark on such a policy is doomed to failure."
More top news
The victim of a "violent and sustained attack" on the top deck of a London bus has been named as Archie Sheppard.
Transport for London has made the badges and accompanying cards permanently available after a successful trial in autumn last year.
A rapist has been given three life sentences for a vicious attack on an 81-year-old woman minutes after he sat next to her on a bus.