If you read the book, then you got a completely different message than I did. The bombing of the LA Times in 1910 was assholery, and Adamic derided it as such.
Adamic was an immigrant. Most of the folks leading the US labor movement were immigrants - some were even Anarchists!
US labor history was a constant struggle between the trade union camps and the "all workers" camps. The ruling class eventually came to accept the trade unions as a necessary evil, but always worked to undermine and neuter their power. Some would say the AFL-CIO remain co-opted to this day. But the Wobblies caught fire from the ruling class *and *the professional unions. Until Trump, Eugene Debs held the record for most presidential votes for a convicted felon.
That labor was two competing ideas that hated each other but hated their bosses more is mostly overlooked these days, but Adamic covers it because it was common knowledge at the time.