What she is trying to say is that people have the right to form groups, but not force their agenda down on others.
The said group cannot prevent other group from working.
Also if they want to strike, the employers have all rights to hire new people to work.
Those all are concepts of freedom.
The state should not give in to special pressure groups.
And that would do absolutely nothing to stop the Trade Unions doing what they did in Britain in OTL, as I have said already.