Unions have reacted furiously to new legislation that would tighten rules on strike ballots and political donations.
Under the Trade Union Bill, a turnout of at least 50% of members will be needed to authorise action.
Labour’s shadow business secretary Chuka Umunna has described the government's trade union reform plans as " the latest in a long line of attempts to stifle reasonable democratic scrutiny, protest and challenge".
He said: "The bill tries to drive a false wedge between government, industry, employees and the public by restricting rights – and at worst criminalising – ordinary working people, from midwives to factory workers to challenge low-pay or health and safety concerns.
“After muzzling charities and restricting access to justice this is the latest attempt to silence critics of this government and its policies.”
The motive for the changes to strike rules may be more complex than the government is prepared to admit.
The Trade Union Bill is getting its first reading in Parliament latter today. Various strict new measures are expected.
The Government has come under fire as it launches its biggest campaign against trade unions in 30 years.