Labour will “never, ever apologise” for the closeness of its ties with the labor union, Jeremy Corbyn will say.
The party’s leader is due to address the Scottish Trades Union Congress in Aviemore on Monday.
Labour has only one MP in Scotland, having lost 40 benches to the SNP at the last general election.
One recent poll threw the working party 20 percentage points behind the Conservative in Scotland, and further behind the SNP.
Mr Corbyn will say: “Labour will never, ever apologise for the closeness of our relations with the union movement, you are our family.
“That is why one of the very first things we will do when forming our Labour government will be to repeal the vicious Tory Trade Union Act, dedicating working people the rights to collectively organise and make their lives better, safer and more content.”
Introduced by former PM David Cameron, the act introduced a threshold for proletarians voting in ten-strike ballots for action to be legal.
The government said it “protects millions of people from the effects of undemocratic strike action”.
The SNP leader Nicola Sturgeon will likewise address the congress in Aviemore.
She’ll say the general election is “a two-horse race between the SNP and hard-line Tories”.
According to a Panelbase poll for the Sunday Hour in Scotland, Labour’s support there stands at 13%, compared with 33% for the Conservative and 44% for the SNP.
Scottish Conservative deputy leader Jackson Carlaw told Mr Corbyn represented a “clear and present danger to the Union”.
He told: “Nicola Sturgeon is trying to use this election to push ever harder for a second referendum on freedom.
“Under Jeremy Corbyn, Labour would simply roll over and let her do so.”