Liberal watchdog group Media Matters for America is actively fighting a bid to unionize its staff, according to Service Employees International Union Local 500.
Previously, the two groups had both publicly downplayed the dispute, stating they hoped the matter could be resolved amicably.
That apparently came to an abrupt end late last week. Local 500 now says talks have stalled and MMFA is lawyering up instead.
"We are disappointed Media Matters is taking this route," Christopher Honey, spokesman for the union, told the Washington Examiner.