If the employer has evidence that you have engaged in some sort of action that represents potentially unlawful discrimination or harassment under federal regulations (29 CFR Subtitle B
, Chapter XIV), then the employer is required
to take immediate action to remedy the situation, or the employer becomes liable for the alleged discrimination, even if it were later found that no discrimination occurred.
So, the answer is "yes," the employer can change your hours and increase your workload.
Hope this helps.
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