YES!
In order to equalize the disproportionate power between employers and employees, American labor law grants employees the right to unionize and the right to strike, picket, seek injunctions, and other actions to have their demands fulfilled.
The major exception to this rule is if you are considered a "supervisor." A "supervisor", under the National Labor Relations Act is:
"any individual having authority, in the interest of the employer, to hire, transfer, suspend, lay off, recall, promote, discharge, assign, reward, or discipline other employees, or responsibly to direct them, or to adjust their grievances, or effectively to recommend such action, if in connection with the foregoing the exercise of such authority is not of a merely routine or clerical nature, but requires the use of independent judgment. (29 USC 152 (11))"
Some employers misclassify their employees as supervisors in order to prevent them from joining a union.
