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The truck drivers are targeting four companies for now, but may expand the strike, according to Teamsters spokeswoman Barb Maynard.
Businesses large and small and across many sectors share their views on the massive West Coast port cargo delays.
Los Angeles Mayor Eric Garcetti's office says there are "plenty of trucks and drivers."
More needs to be done about these "unfair and unreasonable" fees, according to a joint letter from 94 industry organizations.
The parcel giant reported improved profitability across all business units in the first quarter 2015, thanks primarily to new pricing initiatives, revenue management and strong growth in international volumes.