Worker who makes lots of calls

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Possible Answers:

UMP.

Last seen on: Wall Street Journal Crossword – Feb 23 2019 – Marking the Spot

Random information on the term “UMP”:

During 1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations. He noticed that bluer stars were strongly associated with the spiral arms and yellow stars dominated near the central galactic bulge and within globular star clusters.[1] Two main divisions were defined as Population I and Population II, with another newer division called Population III added in 1978,[2] which are often simply abbreviated as Pop I, II or III.

Between the population types, significant differences were found with their individual observed stellar spectra. These were later shown to be very important, and were possibly related to star formation, observed kinematics,[3] stellar age, and even galaxy evolution in both spiral or elliptical galaxies. These three simple population classes usefully divided stars by their chemical composition or metallicity,[a][b] whose small proportion of chemical abundance consists of heavier elements against the far more abundant hydrogen and helium.[4][3]

UMP on Wikipedia