Crimping or Shanghaiing was the act of kidnapping…

““Crimping or Shanghaiing was the act of kidnapping unsuspecting men to serve aboard ships usually destined to sail to the far east. In most cases this happened on the waterfront of cities such as London, Bristol and Hull in England and San Francisco, Portland, Seattle, Port Townsend on the West Coast and New York, Boston, Philadelphia, and Baltimore on the on the East Coast of the United States. Portland, Oregon. In the mid-19th century eventually became the most infamously known city for shanghaiing. People engaged in this form of kidnapping were known as crimps and those members of a ship’s crew that were acquired in this way were referred to as being part of a ships “press gang.” This term had its origin Great Britain's Royal Navy. The need for Shanghaiing grew from shortage of sailors first in the British navy in England and then on merchant ships sailing on the lengthy trade routes primarily to China. With many seamen jumping ship along the west coast and joining the California Gold Rush it developed a cottage industry for boarding masters known as crimps, who found crews for ships. Being paid for every person they delivered there was a strong incentive to find as many seamen as possible and for this they were paid what was named blood money. Records show that these crimps could receive a percentage of the man’s pay or in some cases thousands of dollars of advance pay against the seaman’s pay for the voyage. In 1884 the practice of Crimping or Shanghaiing was curtailed when the Dingley Act came into effect. This law prohibited the taking advantage of the seamen, although some loopholes allowed the practice to continue into the 20th century.””

— Captain Hank Bracker, "Seawater One