Former National Officer at the union UNITE Rachael Maskell told Premier workers' rights were human rights and that strikes are used as a last resort.
She's condemned the Conservative's plans to change the law so a turnout of at least 50% of members will be needed to authorise action.
In key public services - such as health, education, fire, transport, border security and energy - there will be an additional hurdle that a strike must be endorsed by 40% of those entitled to vote.
Speaking at PMQs in the Commons, David Cameron said: "I know that the party opposite will not like this, but the fact is... people affected by these strikes do not get to vote.
"That is why it is right to have these thresholds and I think the whole country will see a Labour Party utterly in hock to the trade unions and they will see a Conservative government wanting to sort this out for hard working families.
"The Labour Party can go round and round and round but it always comes back to the trade unions to call the tune."
But Ms Maskell said: "Workers wouldn't need to take industrial action if there is good employment relations.
"Ultimately, if workers are not treated well then they need to use their ultimate sanction to be able to be heard and we should never quiet the voice of people who are struggling.
"Whether it's around their pay, their pensions or their wellbeing at work issues, we must support people."
She added: "When workers raise concerns, there are reasons why they do that, they're not being difficult, they're just asking for fairness."
Listen to Rachael Maskell speaking to Premier's Marcus Jones:
