All union members pay dues.
That's the bottom.
Union memberships also get political attention as voting blocks.
Give the illegals union membership and the right to vote and the diminishing union membership increases in strength again.
And so does the income of the unions.
The unions, some Churches, and the Democrats....follow the MONEY!
The problem is that once the illegals become unionized, they are unemployable. They are only employable now because they will work for far lower than even non-union wages.
The moment the illegals start a union, their employers will go back to employing legal non-union workers.
Why not they have stolen Union construction jobs