Costco accused of unfair labor practices by Teamsters union

The Teamsters union has accused a company of expelling union reps, harassing workers, and changing locks on union boards. These allegations arise just before negotiations for a new agreement covering 18,000 Costco Teamsters, with talks resuming after a suspension in August. The current contract expires at the end of January.

What actions did the company allegedly take against union representatives?

What is the expiration date of the current contract?