Steve Peoples

Associated Press

Democratic presidential candidate former Vice President Joe Biden speaks at the first-ever 'Workers' Presidential Summit' at the Convention Center in Philadelphia, Tuesday, Sept. 17, 2019. The Philadelphia Council of the AFL-CIO hosted the event.

Sanders-Biden Feud n Front of Union

The tension between the two leading candidates came during what organizers called a 'workers' presidential summit'.

In this March 13, 2017 photo, Scott Heiferman, CEO of Meetup, talks during an interview in New York. The online networking site is partnering with a left-leaning labor union and a former Hillary Clinton aide to roll out a platform for organizing people who oppose President Donald Trump.

Tech Company Takes Risky Leap

CEO says, "When a certain line is crossed, we have a civic duty not to be quiet."