One of the unions behind the public sector strike has dismissed Conservative calls for tougher rules on strike ballots as "utter hypocrisy". Many Tory MPs now want a requirement for strikes to be backed by more than half the workforce, not just the majority of those who actually vote in a ballot.
Unite said its research showed that no Tory MP was elected with the votes of over 50% of the electorate. The union claimed that the Welsh Secretary, David Jones, had the least backing of any cabinet member, with just 27% support in his Clwyd West constituency.
Membership of trade unions across the UK is falling, but Wales is bucking the trend. Recent figures show that 40,000 more workers were members of trade unions in 2013, compared to 2012.
Unison welcomed the increase in numbers. A spokesperson said, "Trade unions are as important now as they have ever been. Workers would not have annual leave, maternity and paternity leave, and sick leave if it weren't for trade unions."
At their in 1979 peak trade unions membership reached over 13 million across the UK. Since then the numbers have been steadily declining as the world of work has changed. The workforce in industries such as mining, which were traditionally heavily unionised, has shrunk dramatically.
Experts say the growth in Wales might be because younger people are more likely to join unions if their parents were members.