The Conservative report included an opinion poll, which found that 48% of Londoners support some kind of ban on strike action.
A complete ban - which would see workers sacked for withdrawing their labour - was backed by 16%.
Another 15% supported the introduction of rules used on the New York subway, which bansstrike action but give unions a right to binding arbitration. And a further 16% favoured pendulum arbitration in which a judge cannot compromise but has to choose between either the employers or unions position.
The survey also found that:
- 59% think it is too easy for Tube workers to go on strike.
- Only 14% of Londoners back the status quo on strike law and 6% want to make it easier to strike.
More top news
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The family of the police officer who was murdered in the Westminster attack have thanked those who were with him 'in his last moments'.