Two types of union members. Some are in the private sector (UMW, UAW, Teamsters, trade unions). Some are in the government sector (SEIU, AFSCME, NEA, etc). Big difference between them.
Even FDR knew government unions are bad for the nation.
Arguably one of our very greatest Presidents said the following in 1906:
“The Republican Party does not belong to the Corporations. It is Lincoln’s Party of plain people”. This observation was the driver behind his Bull-Moose insurgency of 1912.
Teddy Roosevelt grasped what Disraeli and Von Bismarck had, a generation earlier. Future political power lay in the hands of the non-Socialist working class, not the moneyed class. Hence his mutual friendship and alliance w/Samuel Gompers of the AFofL.
But Taft, your quintessential political crony and in the pocket of the corporate monopolists, wouldn’t have it; so the election went to Wilson. A fateful opportunity was missed whose consequences are plain to see and still reverberate loudly to this day..