From Hollywood to auto work, organized labor is flexing its muscles. Where do unions stand today?

abcnews.go.com:

From Hollywood to auto production lines, U.S. labor unions are once again in the national spotlight

NEW YORK — Once again, U.S. labor unions are flexing their muscles in the national spotlight.

In Hollywood, the actors union reached a tentative deal with major studios late Wednesday to end a months-long strike. Las Vegas hotel workers also scored breakthough agreements with Caesars Entertainment and MGM Resorts International this week — and last month, United Auto Workers celebrated victories on many of key demands that led to its six-week waves of walkouts against the Detroit Three.

But despite historic strikes and record contract deals seen this year, there's a lot stacked against labor organizers today — particularly for those who aren't part of larger, more established unions in sectors with stronger organizing roots. Union membership rates in the U.S. have also been falling for decades due to changes in the economy, employer opposition, growing political partisanship and persiting legal challenges.

“Even though we’re seeing stronger support for unions, (with) the highest popularity of union favorability in polls since at least the 1960s, translating the worker desire for representation into actual representation is really hard under our current system,” Alexander Colvin, dean of Cornell University's School of Industrial and Labor Relations, previously told The Associated Press.

Still, some labor advocates see growing momentum. Here's where things stand.

Across the U.S., hundreds of thousands of workers have participated in strikes this year. Labor activism has surged in tandem with soaring costs of living and rising inequality, particularly the growing pay gap between workers and top executives. Those inequities