UFCW is somehow affiliated with the teamsters you can tell the difference easily between the two in a picket line.
They also went out on strike years ago when I was just out of high school. I had a friend who was recently hire by the store who was out picketing. I talked to him before I went into the store. When I left to go into the store he was going to go in the store with me to buy some lunch. I had to tell him how a strike worked. He asked some others with to male sure.
If the Teamsters were involved it could have been the Union truck drivers picketing in solidarity whit their fellow “brothers and sisters.”